chore(package): update eslint-config-prettier to version 6.1.0

Closes #63

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
     "ember-source-channel-url": "^1.1.0",
     "ember-try": "^1.1.0",
     "eslint": "^5.15.3",
-    "eslint-config-prettier": "^4.1.0",
+    "eslint-config-prettier": "^6.1.0",
     "eslint-plugin-ember": "^6.3.0",
     "eslint-plugin-node": "^8.0.1",
     "eslint-plugin-prettier": "2.6.0",