Add gitlab to socialite documentation

socialite.md

@@ -12,7 +12,7 @@
 <a name="introduction"></a>
 ## Introduction
 
-In addition to typical, form based authentication, Laravel also provides a simple, convenient way to authenticate with OAuth providers using [Laravel Socialite](https://github.com/laravel/socialite). Socialite currently supports authentication with Facebook, Twitter, LinkedIn, Google, GitHub and Bitbucket.
+In addition to typical, form based authentication, Laravel also provides a simple, convenient way to authenticate with OAuth providers using [Laravel Socialite](https://github.com/laravel/socialite). Socialite currently supports authentication with Facebook, Twitter, LinkedIn, Google, GitHub, GitLab and Bitbucket.
 
 > {tip} Adapters for other platforms are listed at the community driven [Socialite Providers](https://socialiteproviders.github.io/) website.
 
@@ -26,7 +26,7 @@ To get started with Socialite, use Composer to add the package to your project's
 <a name="configuration"></a>
 ## Configuration
 
-Before using Socialite, you will also need to add credentials for the OAuth services your application utilizes. These credentials should be placed in your `config/services.php` configuration file, and should use the key `facebook`, `twitter`, `linkedin`, `google`, `github` or `bitbucket`, depending on the providers your application requires. For example:
+Before using Socialite, you will also need to add credentials for the OAuth services your application utilizes. These credentials should be placed in your `config/services.php` configuration file, and should use the key `facebook`, `twitter`, `linkedin`, `google`, `github`, `gitlab` or `bitbucket`, depending on the providers your application requires. For example:
 
     'github' => [
         'client_id' => env('GITHUB_CLIENT_ID'),         // Your GitHub Client ID