chore(package): update eslint-config-airbnb to version 15.0.0

Author: greenkeeper[bot]

package.json

@@ -58,7 +58,7 @@
     "webpack-dev-middleware": "^1.8.4",
     "webpack-hot-middleware": "^2.13.2",
     "eslint": "^3.19.0",
-    "eslint-config-airbnb": "^14.1.0",
+    "eslint-config-airbnb": "^15.0.0",
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-jsx-a11y": "^4.0.0",
     "eslint-plugin-react": "^6.10.3"