Add URL to eslint globals. (#27674)

Summary:
Fix eslint complaining about URL not being defined.
Pull Request resolved: https://github.com/facebook/react-native/pull/27674

Differential Revision: D19296779

Pulled By: cpojer

fbshipit-source-id: a62efdf0a5ad40c9575b9fa0f94156f1574cb018

packages/eslint-config-react-native-community/index.js

@@ -110,6 +110,7 @@ module.exports = {
     setImmediate: true,
     setInterval: false,
     setTimeout: false,
+    URL: false,
     WebSocket: true,
     window: false,
     XMLHttpRequest: false,