chore(package): update mocha to version 5.0.0 (#1446)

Author: greenkeeper[bot]

package.json

@@ -79,7 +79,7 @@
     "eslint-plugin-standard": "^3.0.1",
     "istanbul": "^0.4.4",
     "jsdoc": "^3.5.5",
-    "mocha": "^4.0.0",
+    "mocha": "^5.0.0",
     "prebuild": "^7.4.0",
     "proxyquire": "^1.7.10",
     "sinon": "^4.1.5"