chore(package): update eslint-config-prettier to version 6.0.0

Closes #12

Author: greenkeeper[bot]

Diff for: package.json

@@ -50,7 +50,7 @@
     "del-cli": "^1.1.0",
     "eslint": "^4.4.1",
     "eslint-config-airbnb-base": "^12.1.0",
-    "eslint-config-prettier": "^2.3.0",
+    "eslint-config-prettier": "^6.0.0",
     "eslint-plugin-import": "^2.7.0",
     "eslint-plugin-prettier": "^2.1.2",
     "graphql": "^0.11.7",