chore(package): update mocha to version 5.0.3

Closes #11

Author: greenkeeper[bot]

Diff for: package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "documentation": "4.0.0-beta4",
     "jsdoctest": "1.7.0",
-    "mocha": "3.2.0",
+    "mocha": "5.0.3",
     "remark": "^7.0.0",
     "tap": "^10.3.2"
   }