chore(package): update eslint-config-airbnb to version 18.1.0

Closes #6

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "babel-preset-react": "^6.24.1",
     "babel-runtime": "^6.18.0",
     "eslint": "^4.10.0",
-    "eslint-config-airbnb": "^16.1.0",
+    "eslint-config-airbnb": "^18.1.0",
     "eslint-plugin-react": "^7.4.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",
     "eslint-plugin-import": "^2.1.0",