fix(package): update eslint-plugin-prettier to version 3.1.2

Closes #14

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "eslint-plugin-babel": "^4.1.2",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",
-    "eslint-plugin-prettier": "^2.3.1",
+    "eslint-plugin-prettier": "^3.1.2",
     "eslint-plugin-react": "^7.4.0"
   },
   "scripts": {