chore(package): update eslint-plugin-promise to version 4.2.1

Closes #227

Author: greenkeeper[bot]

package.json

@@ -94,7 +94,7 @@
     "eslint-config-standard": "^11.0.0",
     "eslint-plugin-import": "^2.9.0",
     "eslint-plugin-node": "^6.0.1",
-    "eslint-plugin-promise": "^3.7.0",
+    "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-react": "^7.7.0",
     "eslint-plugin-standard": "^3.0.1",
     "ignore-styles": "^5.0.1",