chore(deps): update dependency eslint-plugin-promise to v4.2.1 (#389)

Author: renovate[bot]

package.json

@@ -60,7 +60,7 @@
     "eslint-config-standard": "12.0.0",
     "eslint-plugin-import": "2.18.0",
     "eslint-plugin-node": "9.1.0",
-    "eslint-plugin-promise": "4.1.1",
+    "eslint-plugin-promise": "4.2.1",
     "eslint-plugin-standard": "4.0.0",
     "mocha": "6.1.4",
     "mock-git": "2.0.0",