chore(package): update eslint-plugin-mocha to version 6.2.1

Closes #112

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
   "homepage": "https://crossorigin.me",
   "devDependencies": {
     "eslint": "3.18.0",
-    "eslint-plugin-mocha": "4.11.0",
+    "eslint-plugin-mocha": "6.2.1",
     "mocha": "3.1.2",
     "supertest": "2.0.1"
   },