chore(package): update eslint-plugin-node to version 9.1.0

Closes #73

Author: greenkeeper[bot]

package.json

@@ -76,7 +76,7 @@
     "ember-source-channel-url": "^1.0.1",
     "ember-try": "^1.0.0-beta.2",
     "eslint-plugin-ember": "^5.1.0",
-    "eslint-plugin-node": "^6.0.1",
+    "eslint-plugin-node": "^9.1.0",
     "loader.js": "^4.2.3",
     "qunit-dom": "^0.6.2",
     "testdouble": "^3.5.0"