chore(package): update mocha to version 7.2.0

Closes #89

Author: greenkeeper[bot]

package.json

@@ -22,7 +22,7 @@
     "automutate-tests": "^0.1.3",
     "chai": "^4.2.0",
     "merge2": "^1.2.3",
-    "mocha": "^5.2.0",
+    "mocha": "^7.2.0",
     "run-sequence": "^2.2.1",
     "tslint": "5.11.0",
     "typescript": "^3.1.6"