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

Closes #58

Author: greenkeeper[bot]

package.json

@@ -83,7 +83,7 @@
     "eslint-plugin-flowtype": "^2.46.1",
     "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-react": "^7.7.0",
     "eslint-plugin-standard": "^3.0.1",
     "http-errors": "^1.6.3",