Composer update

* updated Laravel to v5.6.38
* Added laravel tinker in dev dependencies

vendor/laravel/tinker/README.md

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+<p align="center"><img src="https://laravel.com/assets/img/components/logo-tinker.svg"></p>
+
+<p align="center">
+<a href="https://travis-ci.org/laravel/tinker"><img src="https://travis-ci.org/laravel/tinker.svg" alt="Build Status"></a>
+<a href="https://packagist.org/packages/laravel/tinker"><img src="https://poser.pugx.org/laravel/tinker/d/total.svg" alt="Total Downloads"></a>
+<a href="https://packagist.org/packages/laravel/tinker"><img src="https://poser.pugx.org/laravel/tinker/v/stable.svg" alt="Latest Stable Version"></a>
+<a href="https://packagist.org/packages/laravel/tinker"><img src="https://poser.pugx.org/laravel/tinker/license.svg" alt="License"></a>
+</p>
+
+## Introduction
+
+Laravel Tinker is a powerful REPL for the Laravel framework.
+
+## Installation
+
+To get started with Laravel Tinker, simply run:
+
+    composer require laravel/tinker
+
+If you are using Laravel 5.5+, there is no need to manually register the service provider. However, if you are using an earlier version of Laravel, register the `TinkerServiceProvider` in your `app` configuration file:
+
+```php
+'providers' => [
+    // Other service providers...
+
+    Laravel\Tinker\TinkerServiceProvider::class,
+],
+```
+
+## Basic Usage
+
+From your console, execute the `php artisan tinker` command.
+
+## License
+
+Laravel Tinker is open-sourced software licensed under the [MIT license](http://opensource.org/licenses/MIT)