diff --git a/package-lock.json b/package-lock.json
index 893bce2..5fff338 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1382,6 +1382,12 @@
         "es5-ext": "0.10.41"
       }
     },
+    "dargs": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/dargs/-/dargs-5.1.0.tgz",
+      "integrity": "sha1-7H6lDHhWTNNsnV7Bj2Yyn63ieCk=",
+      "dev": true
+    },
     "dashdash": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
@@ -2484,12 +2490,6 @@
       "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
       "dev": true
     },
-    "graceful-readlink": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
-      "integrity": "sha1-TK+tdrxi8C+gObL5Tpo906ORpyU=",
-      "dev": true
-    },
     "growl": {
       "version": "1.10.3",
       "resolved": "https://registry.npmjs.org/growl/-/growl-1.10.3.tgz",
@@ -2637,102 +2637,154 @@
       }
     },
     "gulp-mocha": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/gulp-mocha/-/gulp-mocha-3.0.1.tgz",
-      "integrity": "sha1-qwyiw5QDcYF03drXUOY6Yb4X4EE=",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/gulp-mocha/-/gulp-mocha-6.0.0.tgz",
+      "integrity": "sha512-FfBldW5ttnDpKf4Sg6/BLOOKCCbr5mbixDGK1t02/8oSrTCwNhgN/mdszG3cuQuYNzuouUdw4EH/mlYtgUscPg==",
       "dev": true,
       "requires": {
-        "gulp-util": "3.0.8",
-        "mocha": "3.5.3",
-        "plur": "2.1.2",
-        "req-cwd": "1.0.1",
-        "temp": "0.8.3",
-        "through": "2.3.8"
+        "dargs": "^5.1.0",
+        "execa": "^0.10.0",
+        "mocha": "^5.2.0",
+        "npm-run-path": "^2.0.2",
+        "plugin-error": "^1.0.1",
+        "supports-color": "^5.4.0",
+        "through2": "^2.0.3"
       },
       "dependencies": {
-        "browser-stdout": {
-          "version": "1.3.0",
-          "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
-          "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+        "arr-diff": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
+          "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
           "dev": true
         },
-        "commander": {
-          "version": "2.9.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
-          "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
+        "arr-union": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
+          "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
+          "dev": true
+        },
+        "cross-spawn": {
+          "version": "6.0.5",
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
+          "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
           "dev": true,
           "requires": {
-            "graceful-readlink": "1.0.1"
+            "nice-try": "^1.0.4",
+            "path-key": "^2.0.1",
+            "semver": "^5.5.0",
+            "shebang-command": "^1.2.0",
+            "which": "^1.2.9"
           }
         },
         "debug": {
-          "version": "2.6.8",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.8.tgz",
-          "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw=",
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
           "dev": true,
           "requires": {
             "ms": "2.0.0"
           }
         },
-        "diff": {
-          "version": "3.2.0",
-          "resolved": "https://registry.npmjs.org/diff/-/diff-3.2.0.tgz",
-          "integrity": "sha1-yc45Okt8vQsFinJck98pkCeGj/k=",
-          "dev": true
-        },
-        "glob": {
-          "version": "7.1.1",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.1.tgz",
-          "integrity": "sha1-gFIR3wT6rxxjo2ADBs31reULLsg=",
+        "execa": {
+          "version": "0.10.0",
+          "resolved": "https://registry.npmjs.org/execa/-/execa-0.10.0.tgz",
+          "integrity": "sha512-7XOMnz8Ynx1gGo/3hyV9loYNPWM94jG3+3T3Y8tsfSstFmETmENCMU/A/zj8Lyaj1lkgEepKepvd6240tBRvlw==",
           "dev": true,
           "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "cross-spawn": "^6.0.0",
+            "get-stream": "^3.0.0",
+            "is-stream": "^1.1.0",
+            "npm-run-path": "^2.0.0",
+            "p-finally": "^1.0.0",
+            "signal-exit": "^3.0.0",
+            "strip-eof": "^1.0.0"
+          }
+        },
+        "extend-shallow": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-3.0.2.tgz",
+          "integrity": "sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=",
+          "dev": true,
+          "requires": {
+            "assign-symbols": "^1.0.0",
+            "is-extendable": "^1.0.1"
           }
         },
         "growl": {
-          "version": "1.9.2",
-          "resolved": "https://registry.npmjs.org/growl/-/growl-1.9.2.tgz",
-          "integrity": "sha1-Dqd0NxXbjY3ixe3hd14bRayFwC8=",
+          "version": "1.10.5",
+          "resolved": "https://registry.npmjs.org/growl/-/growl-1.10.5.tgz",
+          "integrity": "sha512-qBr4OuELkhPenW6goKVXiv47US3clb3/IbuWF9KNKEijAy9oeHxU9IgzjvJhHkUzhaj7rOUD7+YGWqUjLp5oSA==",
           "dev": true
         },
         "has-flag": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-1.0.0.tgz",
-          "integrity": "sha1-nZ55MWXOAXoA8AQYxD+UKnsdEfo=",
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
           "dev": true
         },
-        "mocha": {
-          "version": "3.5.3",
-          "resolved": "https://registry.npmjs.org/mocha/-/mocha-3.5.3.tgz",
-          "integrity": "sha512-/6na001MJWEtYxHOV1WLfsmR4YIynkUEhBwzsb+fk2qmQ3iqsi258l/Q2MWHJMImAcNpZ8DEdYAK72NHoIQ9Eg==",
+        "is-extendable": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/is-extendable/-/is-extendable-1.0.1.tgz",
+          "integrity": "sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==",
           "dev": true,
           "requires": {
-            "browser-stdout": "1.3.0",
-            "commander": "2.9.0",
-            "debug": "2.6.8",
-            "diff": "3.2.0",
-            "escape-string-regexp": "1.0.5",
-            "glob": "7.1.1",
-            "growl": "1.9.2",
-            "he": "1.1.1",
-            "json3": "3.3.2",
-            "lodash.create": "3.1.1",
-            "mkdirp": "0.5.1",
-            "supports-color": "3.1.2"
+            "is-plain-object": "^2.0.4"
           }
         },
-        "supports-color": {
-          "version": "3.1.2",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-3.1.2.tgz",
-          "integrity": "sha1-cqJiiU2dQIuVbKBf83su2KbiotU=",
+        "mocha": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/mocha/-/mocha-5.2.0.tgz",
+          "integrity": "sha512-2IUgKDhc3J7Uug+FxMXuqIyYzH7gJjXECKe/w43IGgQHTSj3InJi+yAA7T24L9bQMRKiUEHxEX37G5JpVUGLcQ==",
           "dev": true,
           "requires": {
-            "has-flag": "1.0.0"
+            "browser-stdout": "1.3.1",
+            "commander": "2.15.1",
+            "debug": "3.1.0",
+            "diff": "3.5.0",
+            "escape-string-regexp": "1.0.5",
+            "glob": "7.1.2",
+            "growl": "1.10.5",
+            "he": "1.1.1",
+            "minimatch": "3.0.4",
+            "mkdirp": "0.5.1",
+            "supports-color": "5.4.0"
+          }
+        },
+        "plugin-error": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/plugin-error/-/plugin-error-1.0.1.tgz",
+          "integrity": "sha512-L1zP0dk7vGweZME2i+EeakvUNqSrdiI3F91TwEoYiGrAfUXmVv6fJIq4g82PAXxNsWOp0J7ZqQy/3Szz0ajTxA==",
+          "dev": true,
+          "requires": {
+            "ansi-colors": "^1.0.1",
+            "arr-diff": "^4.0.0",
+            "arr-union": "^3.1.0",
+            "extend-shallow": "^3.0.2"
+          }
+        },
+        "semver": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.5.0.tgz",
+          "integrity": "sha512-4SJ3dm0WAwWy/NVeioZh5AntkdJoWKxHxcmyP622fOkgHa4z3R0TdBJICINyaSDE6uNwVc8gZr+ZinwZAH4xIA==",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
+          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        },
+        "through2": {
+          "version": "2.0.3",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.3.tgz",
+          "integrity": "sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=",
+          "dev": true,
+          "requires": {
+            "readable-stream": "^2.1.5",
+            "xtend": "~4.0.1"
           }
         }
       }
@@ -3334,12 +3386,6 @@
       "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-1.0.0.tgz",
       "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY="
     },
-    "irregular-plurals": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/irregular-plurals/-/irregular-plurals-1.4.0.tgz",
-      "integrity": "sha1-LKmwM2UREYVUEvFr5dd8YqRYp2Y=",
-      "dev": true
-    },
     "is-absolute": {
       "version": "0.2.6",
       "resolved": "https://registry.npmjs.org/is-absolute/-/is-absolute-0.2.6.tgz",
@@ -4131,12 +4177,6 @@
       "integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=",
       "dev": true
     },
-    "json3": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/json3/-/json3-3.3.2.tgz",
-      "integrity": "sha1-PAQ0dD35Pi9cQq7nsZvLSDV19OE=",
-      "dev": true
-    },
     "jsonfile": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
@@ -4682,28 +4722,12 @@
       "integrity": "sha512-svL3uiZf1RwhH+cWrfZn3A4+U58wbP0tGVTLQPbjplZxZ8ROD9VLuNgsRniTlLe7OlSqR79RUehXgpBW/s0IQw==",
       "dev": true
     },
-    "lodash._baseassign": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/lodash._baseassign/-/lodash._baseassign-3.2.0.tgz",
-      "integrity": "sha1-jDigmVAPIVrQnlnxci/QxSv+Ck4=",
-      "dev": true,
-      "requires": {
-        "lodash._basecopy": "3.0.1",
-        "lodash.keys": "3.1.2"
-      }
-    },
     "lodash._basecopy": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/lodash._basecopy/-/lodash._basecopy-3.0.1.tgz",
       "integrity": "sha1-jaDmqHbPNEwK2KVIghEd08XHyjY=",
       "dev": true
     },
-    "lodash._basecreate": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/lodash._basecreate/-/lodash._basecreate-3.0.3.tgz",
-      "integrity": "sha1-G8ZhYU2qf8MRt9A78WgGoCE8+CE=",
-      "dev": true
-    },
     "lodash._basetostring": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/lodash._basetostring/-/lodash._basetostring-3.0.1.tgz",
@@ -4752,17 +4776,6 @@
       "integrity": "sha1-+6HEUkwZ7ppfgTa0YJ8BfPTe1pI=",
       "dev": true
     },
-    "lodash.create": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/lodash.create/-/lodash.create-3.1.1.tgz",
-      "integrity": "sha1-1/KEnw29p+BGgruM1yqwIkYd6+c=",
-      "dev": true,
-      "requires": {
-        "lodash._baseassign": "3.2.0",
-        "lodash._basecreate": "3.0.3",
-        "lodash._isiterateecall": "3.0.9"
-      }
-    },
     "lodash.escape": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/lodash.escape/-/lodash.escape-3.2.0.tgz",
@@ -5522,6 +5535,12 @@
       "integrity": "sha1-yobR/ogoFpsBICCOPchCS524NCw=",
       "dev": true
     },
+    "nice-try": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/nice-try/-/nice-try-1.0.4.tgz",
+      "integrity": "sha512-2NpiFHqC87y/zFke0fC0spBXL3bBsoh/p5H1EFhshxjCR5+0g2d6BiXbUFz9v1sAcxsk2htp2eQnNIci2dIYcA==",
+      "dev": true
+    },
     "nise": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/nise/-/nise-1.3.3.tgz",
@@ -5909,12 +5928,6 @@
         "mem": "1.1.0"
       }
     },
-    "os-tmpdir": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
-      "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
-      "dev": true
-    },
     "p-finally": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
@@ -6250,15 +6263,6 @@
         "extend-shallow": "1.1.4"
       }
     },
-    "plur": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/plur/-/plur-2.1.2.tgz",
-      "integrity": "sha1-dIJFLBoPUI4+NE6uwxLJHCncZVo=",
-      "dev": true,
-      "requires": {
-        "irregular-plurals": "1.4.0"
-      }
-    },
     "pn": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/pn/-/pn-1.1.0.tgz",
@@ -6678,24 +6682,6 @@
       "integrity": "sha1-KbvZIHinOfC8zitO5B6DeVNSKSQ=",
       "dev": true
     },
-    "req-cwd": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/req-cwd/-/req-cwd-1.0.1.tgz",
-      "integrity": "sha1-DXOurpJm5penj3l2AZZ352rPD/8=",
-      "dev": true,
-      "requires": {
-        "req-from": "1.0.1"
-      }
-    },
-    "req-from": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/req-from/-/req-from-1.0.1.tgz",
-      "integrity": "sha1-v4HaUUeUfTLRO5R9wSpYrUWHNQ4=",
-      "dev": true,
-      "requires": {
-        "resolve-from": "2.0.0"
-      }
-    },
     "request": {
       "version": "2.85.0",
       "resolved": "https://registry.npmjs.org/request/-/request-2.85.0.tgz",
@@ -6802,12 +6788,6 @@
         "global-modules": "1.0.0"
       }
     },
-    "resolve-from": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-2.0.0.tgz",
-      "integrity": "sha1-lICrIOlP+h2egKgEx+oUdhGWa1c=",
-      "dev": true
-    },
     "resolve-options": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/resolve-options/-/resolve-options-1.1.0.tgz",
@@ -7979,24 +7959,6 @@
         "sprintf": "0.1.5"
       }
     },
-    "temp": {
-      "version": "0.8.3",
-      "resolved": "https://registry.npmjs.org/temp/-/temp-0.8.3.tgz",
-      "integrity": "sha1-4Ma8TSa5AxJEEOT+2BEDAU38H1k=",
-      "dev": true,
-      "requires": {
-        "os-tmpdir": "1.0.2",
-        "rimraf": "2.2.8"
-      },
-      "dependencies": {
-        "rimraf": {
-          "version": "2.2.8",
-          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.2.8.tgz",
-          "integrity": "sha1-5Dm+Kq7jJzIZUnMPmaiSnk/FBYI=",
-          "dev": true
-        }
-      }
-    },
     "term-size": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/term-size/-/term-size-1.2.0.tgz",
diff --git a/package.json b/package.json
index d7ff0f7..70d29d3 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
         "gulp": "^3.9.1",
         "gulp-clean": "^0.4.0",
         "gulp-istanbul": "^1.1.3",
-        "gulp-mocha": "^3.0.1",
+        "gulp-mocha": "^6.0.0",
         "gulp-shell": "^0.6.5",
         "gulp-sourcemaps": "^2.6.4",
         "gulp-typescript": "^4.0.2",