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

Closes #15

Author: greenkeeper[bot]

package.json

@@ -21,7 +21,7 @@
     "eslint-config-standard": "^12.0.0",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-jest": "^21.5.0",
-    "eslint-plugin-node": "^7.0.1",
+    "eslint-plugin-node": "^9.1.0",
     "eslint-plugin-promise": "^4.0.0",
     "eslint-plugin-standard": "^4.0.0",
     "eslint-plugin-vue": "^4.3.0"