chore(package): update mocha to version 6.0.2

Closes #17

Author: greenkeeper[bot]

package.json

@@ -19,7 +19,7 @@
     "chai": "^4.1.2",
     "chai-as-promised": "^7.1.1",
     "decompress": "^4.2.0",
-    "mocha": "^5.0.4",
+    "mocha": "^6.0.2",
     "mocha-appveyor-reporter": "^0.4.0",
     "mocha-junit-reporter": "^1.17.0",
     "progress": "^2.0.0",