chore(package): update eslint-config-airbnb to version 9.0.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -45,7 +45,7 @@
     "config": "^1.20.1",
     "connect": "^3.4.1",
     "coveralls": "^2.11.9",
-    "eslint-config-airbnb": "^8.0.0",
+    "eslint-config-airbnb": "^9.0.0",
     "eslint-plugin-import": "^1.6.1",
     "eslint-plugin-jsx-a11y": "^1.0.4",
     "eslint-plugin-react": "^5.0.1",