docs: docs updated for laravel 7

Author: mitulgolakiya

README.md

@@ -13,6 +13,10 @@ Run a command,
 
 `composer require infyomlabs/laravel-ui-adminlte`
 
+For Laravel 7,
+
+`composer require infyomlabs/laravel-ui-adminlte:^2.0`
+
 For Laravel 6,
 
 `composer require infyomlabs/laravel-ui-adminlte:^1.0`