chore(package): update eslint-plugin-promise to version 4.0.0 (#91)

Author: greenkeeper[bot]

package.json

@@ -22,7 +22,7 @@
     "eslint-config-standard": "^11.0.0",
     "eslint-plugin-import": "^2.13.0",
     "eslint-plugin-node": "^7.0.1",
-    "eslint-plugin-promise": "^3.8.0",
+    "eslint-plugin-promise": "^4.0.0",
     "eslint-plugin-standard": "^3.1.0",
     "mocha": "^5.2.0",
     "nyc": "^12.0.2",