chore(package): update eslint-config-airbnb to version 18.0.1

Closes #4

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "babel-loader": "^7.1.2",
     "babel-preset-env": "^1.6.1",
     "coveralls": "^3.0.0",
-    "eslint-config-airbnb": "^16.1.0",
+    "eslint-config-airbnb": "^18.0.1",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",
     "eslint-plugin-react": "^7.5.0",