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

Closes #14

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "eslint": "5.0.0",
     "eslint-config-standard": "12.0.0",
     "eslint-plugin-import": "2.12.0",
-    "eslint-plugin-mocha": "5.0.0",
+    "eslint-plugin-mocha": "6.2.1",
     "eslint-plugin-node": "7.0.0",
     "eslint-plugin-promise": "4.0.1",
     "eslint-plugin-standard": "3.1.0",