fix tests (#293)

Author: joedixon

tests/Unit/EventTest.php

@@ -11,7 +11,7 @@
     app(ServerProviderManager::class)->withPublishing();
     $pubSub = Mockery::mock(PubSubProvider::class);
     $pubSub->shouldReceive('publish')->once()
-        ->with(['type' => 'message', 'application' => serialize($app), 'payload' => ['channel' => 'test-channel'], 'socket_id' => null]);
+        ->with(['type' => 'message', 'application' => serialize($app), 'payload' => ['channel' => 'test-channel']]);
 
     $this->app->instance(PubSubProvider::class, $pubSub);