chore(package): update mocha to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "babel-preset-es2015": "^6.24.1",
     "babel-register": "^6.26.0",
     "chai": "^4.1.2",
-    "mocha": "^4.0.1",
+    "mocha": "^5.0.0",
     "nodemon": "^1.14.1",
     "pre-commit": "^1.2.2",
     "standard": "^10.0.3"