chore(package): update eslint-config-airbnb-base to version 12.0.0

Author: greenkeeper[bot]

package.json

@@ -41,7 +41,7 @@
   },
   "devDependencies": {
     "eslint": "^4.5.0",
-    "eslint-config-airbnb-base": "^11.3.2",
+    "eslint-config-airbnb-base": "^12.0.0",
     "eslint-plugin-import": "^2.7.0"
   },
   "package-deps": [