sendgrid#94 | Bump dev dep mocha to version 5

Author: robincher

package.json

@@ -28,7 +28,7 @@
     "eslint": "^2.7.0",
     "eslint-config-standard": "^5.1.0",
     "eslint-plugin-standard": "^1.3.2",
-    "mocha": "^4.0.0",
+    "mocha": "^5.0.0",
     "nock": "^9.0.14"
   },
   "scripts": {