chore(package): update eslint-plugin-ember to version 7.0.0

Author: greenkeeper[bot]

package.json

@@ -66,7 +66,7 @@
     "ember-resolver": "^5.0.1",
     "ember-sinon": "^2.2.0",
     "ember-source": "~3.8.0",
-    "eslint-plugin-ember": "^6.0.0",
+    "eslint-plugin-ember": "^7.0.0",
     "eslint-plugin-node": "^7.0.1",
     "glob": "^7.1.3",
     "loader.js": "^4.7.0",