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

Closes #11

Author: greenkeeper[bot]

package.json

@@ -15,7 +15,7 @@
     "cssnano": "^4.0.4",
     "eslint": "^5.2.0",
     "eslint-config-prettier": "^2.9.0",
-    "eslint-plugin-prettier": "^2.6.2",
+    "eslint-plugin-prettier": "^3.1.0",
     "html-webpack-plugin": "^3.2.0",
     "husky": "^0.14.3",
     "postcss-loader": "^2.1.6",