chore(package): update eslint-plugin-mocha to version 6.3.0

Closes #33

Author: greenkeeper[bot]

package.json

@@ -67,7 +67,7 @@
     "eslint-config-airbnb": "16.1.0",
     "eslint-plugin-import": "^2.7.0",
     "eslint-plugin-jsx-a11y": "6.0.3",
-    "eslint-plugin-mocha": "^5.0.0",
+    "eslint-plugin-mocha": "^6.3.0",
     "eslint-plugin-react": "^7.3.0",
     "jest": "^24.7.1",
     "jsdom": "11.11.0",