chore(package): update eslint-config-prettier to version 6.8.0

Closes #8

Author: greenkeeper[bot]

package.json

@@ -19,7 +19,7 @@
     "oauth": "^0.9.15"
   },
   "devDependencies": {
-    "eslint-config-prettier": "^2.0.0",
+    "eslint-config-prettier": "^6.8.0",
     "xo": "^0.20.2"
   },
   "peerDependencies": {