chore(package): update eslint-plugin-prettier to version 3.1.0

Closes #28

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
   "devDependencies": {
     "eslint": "^4.18.0",
     "eslint-config-prettier": "^2.9.0",
-    "eslint-plugin-prettier": "^2.6.0",
+    "eslint-plugin-prettier": "^3.1.0",
     "gulp": "^3.9.1",
     "gulp-codacy": "^1.0.0",
     "gulp-coveralls": "^0.1.4",