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

Closes #126

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "cross-env": "^5.2.0",
     "css-modules-require-hook": "^4.2.3",
     "eslint": "^5.12.0",
-    "eslint-config-airbnb": "17.1.0",
+    "eslint-config-airbnb": "18.1.0",
     "eslint-config-prettier": "^4.0.0",
     "eslint-plugin-ava": "^5.1.1",
     "eslint-plugin-babel": "^5.3.0",