chore(package): update eslint-plugin-promise to version 3.4.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -58,7 +58,7 @@
     "eslint-plugin-ava": "^4.0.0",
     "eslint-plugin-babel": "^3.3.0",
     "eslint-plugin-markdown": "^1.0.0-beta.2",
-    "eslint-plugin-promise": "^3.0.0",
+    "eslint-plugin-promise": "^3.4.0",
     "eslint-plugin-require-path-exists": "^1.1.5",
     "eslint-plugin-standard": "^2.0.1",
     "execa": "^0.5.0",