chore(package): update mocha to version 5.0.3

Closes #17

Author: greenkeeper[bot]

package.json

@@ -6,7 +6,7 @@
   "devDependencies": {
     "@neogeek/eslint-config-standards": "^1.15.0",
     "eslint": "^4.5.0",
-    "mocha": "^3.4.2"
+    "mocha": "^5.0.3"
   },
   "scripts": {
     "test": "eslint iknowishouldnt.js test/ && mocha test/**/*.js"