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

Closes #11

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "eslint-loader": "^2.0.0",
     "eslint-plugin-import": "^2.9.0",
     "eslint-plugin-node": "^6.0.1",
-    "eslint-plugin-promise": "^3.7.0",
+    "eslint-plugin-promise": "^4.0.1",
     "eslint-plugin-standard": "^3.0.1",
     "html-loader": "^0.5.5",
     "html-webpack-plugin": "^3.1.0",