chore(package): update eslint-plugin-ember to version 7.6.0

Closes #48

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
     "ember-try": "^1.2.1",
     "eslint": "^4.0.0",
     "eslint-config-prettier": "^2.9.0",
-    "eslint-plugin-ember": "^6.2.0",
+    "eslint-plugin-ember": "^7.6.0",
     "eslint-plugin-node": "^8.0.1",
     "eslint-plugin-prettier": "^2.6.0",
     "loader.js": "^4.2.3",