fix: Remove auto alias

Remove auto alias, avoid the name was declare.

Close #75

Author: CasperLaiTW

README.md

@@ -27,6 +27,12 @@ In your `config/app.php` add  `Casperlaitw\LaravelFbMessenger\LaravelFbMessenger
     Casperlaitw\LaravelFbMessenger\LaravelFbMessengerServiceProvider::class,
     ...
 ],
+
+'alias => [
+    ...
+    'Menu' => Casperlaitw\LaravelFbMessenger\Facades\MessengerMenu::class,
+    ...
+],
 ```
 
 ### Publish Configuration

src/Providers/MenuServiceProvider.php

@@ -18,7 +18,6 @@ class MenuServiceProvider extends ServiceProvider
      */
     public function boot()
     {
-        class_alias(MessengerMenu::class, 'Menu');
         $this->map();
     }