Add Laravel 6 support and ignition solution

.gitignore

@@ -2,4 +2,5 @@ build
 composer.lock
 docs
 vendor
-coverage
+coverage
+.phpunit.result.cache

composer.json

@@ -26,21 +26,22 @@
         "ext-json": "*",
         "cboden/ratchet": "^0.4.1",
         "clue/buzz-react": "^2.5",
+        "facade/ignition-contracts": "^1.0",
         "guzzlehttp/psr7": "^1.5",
-        "illuminate/broadcasting": "5.7.* || 5.8.*",
-        "illuminate/console": "5.7.* || 5.8.*",
-        "illuminate/http": "5.7.* || 5.8.*",
-        "illuminate/routing": "5.7.* || 5.8.*",
-        "illuminate/support": "5.7.* || 5.8.*",
+        "illuminate/broadcasting": "5.7.* || 5.8.* || ^6.0",
+        "illuminate/console": "5.7.* || 5.8.* || ^6.0",
+        "illuminate/http": "5.7.* || 5.8.* || ^6.0",
+        "illuminate/routing": "5.7.* || 5.8.* || ^6.0",
+        "illuminate/support": "5.7.* || 5.8.* || ^6.0",
         "pusher/pusher-php-server": "~3.0 || ~4.0",
+        "react/dns": "^1.1",
         "symfony/http-kernel": "~4.0",
-        "symfony/psr-http-message-bridge": "^1.1",
-        "react/dns": "^1.1"
+        "symfony/psr-http-message-bridge": "^1.1"
     },
     "require-dev": {
         "mockery/mockery": "^1.2",
-        "orchestra/testbench": "3.7.* || 3.8.*",
-        "phpunit/phpunit": "^7.0"
+        "orchestra/testbench": "3.7.* || 3.8.* || ^4.0",
+        "phpunit/phpunit": "^7.0 || ^8.0"
     },
     "autoload": {
         "psr-4": {

src/Exceptions/InvalidApp.php

@@ -3,8 +3,11 @@
 namespace BeyondCode\LaravelWebSockets\Exceptions;
 
 use Exception;
+use Facade\IgnitionContracts\Solution;
+use Facade\IgnitionContracts\BaseSolution;
+use Facade\IgnitionContracts\ProvidesSolution;
 
-class InvalidApp extends Exception
+class InvalidApp extends Exception implements ProvidesSolution
 {
     public static function notFound($appId)
     {
@@ -15,4 +18,13 @@ class InvalidApp extends Exception
     {
         return new static("{$name} is required but was empty for app id `{$appId}`.");
     }
+
+    public function getSolution(): Solution
+    {
+        return BaseSolution::create('Your application id could not be found')
+            ->setSolutionDescription('Make sure that your `config/websockets.php` contains the app key you are trying to use.')
+            ->setDocumentationLinks([
+                'Configuring WebSocket Apps (official documentation)' => 'https://docs.beyondco.de/laravel-websockets/1.0/basic-usage/pusher.html#configuring-websocket-apps',
+            ]);
+    }
 }