ignore public/storage for laravel 5

Ref: https://github.com/laravel/laravel/blob/master/.gitignore#L2

Laravel.gitignore

@@ -7,6 +7,7 @@ app/storage/
 
 # Laravel 5 & Lumen specific
 bootstrap/cache/
+public/storage
 .env.*.php
 .env.php
 .env