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

Closes #135

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "cypress-firebase": "^0.1.4",
     "enzyme": "^3.9.0",
     "enzyme-adapter-react-16": "^1.12.1",
-    "eslint-config-prettier": "^4.2.0",
+    "eslint-config-prettier": "^6.0.0",
     "eslint-plugin-prettier": "^3.0.1",
     "eslint-plugin-react": "^7.12.4",
     "node-sass": "^4.12.0"