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

Closes #236

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "babel-eslint": "10.0.1",
     "coveralls": "^3.0.3",
     "eslint": "^5.16.0",
-    "eslint-config-airbnb": "15.1.0",
+    "eslint-config-airbnb": "18.0.1",
     "eslint-plugin-import": "^2.0.0",
     "eslint-plugin-jsx-a11y": "^5.1.1",
     "eslint-plugin-react": "^7.3.0",