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

Closes #4

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "babel-eslint": "^10.0.2",
     "babel-loader": "^8.0.5",
     "eslint": "^5.16.0",
-    "eslint-config-airbnb": "^17.1.0",
+    "eslint-config-airbnb": "^18.0.1",
     "eslint-config-prettier": "^6.0.0",
     "eslint-loader": "^2.1.2",
     "eslint-plugin-import": "^2.18.0",