chore(package): update eslint-config-prettier to version 6.9.0

Closes #123

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "css-modules-require-hook": "^4.2.3",
     "eslint": "^5.12.0",
     "eslint-config-airbnb": "17.1.0",
-    "eslint-config-prettier": "^4.0.0",
+    "eslint-config-prettier": "^6.9.0",
     "eslint-plugin-ava": "^5.1.1",
     "eslint-plugin-babel": "^5.3.0",
     "eslint-plugin-flowtype": "^3.2.1",