chore(package): update eslint-plugin-ember to version 8.5.2

Closes #70

Author: greenkeeper[bot]

package.json

@@ -75,7 +75,7 @@
     "ember-source": "~3.2.0-beta.2",
     "ember-source-channel-url": "^1.0.1",
     "ember-try": "^1.0.0-beta.2",
-    "eslint-plugin-ember": "^5.1.0",
+    "eslint-plugin-ember": "^8.5.2",
     "eslint-plugin-node": "^6.0.1",
     "loader.js": "^4.2.3",
     "qunit-dom": "^0.6.2",