chore: remove extra require

Summary:
We already have require fs [here](https://github.com/maksimr/react-native/blob/patch-cli/local-cli/cli.js#L34)
Closes facebook#5352

Reviewed By: svcscm

Differential Revision: D2838334

Pulled By: martinbigio

fb-gh-sync-id: 96942b862fee925006687cfba3ad9185a2377a8a

local-cli/cli.js

@@ -18,7 +18,6 @@ var childProcess = require('child_process');
 var Config = require('./util/Config');
 var defaultConfig = require('./default.config');
 var dependencies = require('./dependencies/dependencies');
-var fs = require('fs');
 var generate = require('./generate/generate');
 var library = require('./library/library');
 var link = require('./library/link');