chore(package): update mocha to version 7.1.2

Closes #25

Author: greenkeeper[bot]

package.json

@@ -12,7 +12,7 @@
     "@types/node": "10",
     "@types/shelljs": "^0.8.3",
     "chai": "^4.1.2",
-    "mocha": "^5.0.4",
+    "mocha": "^7.1.2",
     "mocha-parallel-tests": "^2.0.0",
     "nyc": "^11.3.0",
     "ts-node": "^7.0.0",