chore(package): update eslint-plugin-standard to version 4.0.1

Closes #31

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-node": "^6.0.0",
     "eslint-plugin-promise": "^3.6.0",
-    "eslint-plugin-standard": "^3.0.1",
+    "eslint-plugin-standard": "^4.0.1",
     "mocha": "^5.0.0",
     "node-wget-promise": "^0.1.3",
     "sinon": "^4.5.0",