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

Closes #68

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "enzyme": "^3.4.1",
     "enzyme-adapter-react-helper": "^1.3.0",
     "eslint": "^5.3.0",
-    "eslint-config-airbnb": "^17.1.0",
+    "eslint-config-airbnb": "^18.1.0",
     "eslint-plugin-import": "^2.14.0",
     "eslint-plugin-jsx-a11y": "^6.1.1",
     "eslint-plugin-react": "^7.11.1",