Apply fixes from StyleCI (#543)

Author: rennokki

src/ChannelManagers/LocalChannelManager.php

@@ -10,7 +10,6 @@
 use Illuminate\Support\Str;
 use Ratchet\ConnectionInterface;
 use React\EventLoop\LoopInterface;
-use React\Promise\FulfilledPromise;
 use React\Promise\PromiseInterface;
 use stdClass;
 

src/ChannelManagers/RedisChannelManager.php

@@ -202,7 +202,7 @@ public function unsubscribeFromChannel(ConnectionInterface $connection, string $
             ->then(function () use ($connection, $channelName) {
                 return $this->removeChannelFromSet($connection->app->id, $channelName);
             })
-            ->then(function () use($connection) {
+            ->then(function () use ($connection) {
                 return $this->removeConnectionFromSet($connection);
             })
             ->then(function () use ($connection, $channelName, $payload) {

src/Channels/PresenceChannel.php

@@ -28,7 +28,7 @@ public function subscribe(ConnectionInterface $connection, stdClass $payload): b
 
         $this->channelManager
             ->userJoinedPresenceChannel($connection, $user, $this->getName(), $payload)
-            ->then(function () use ($connection, $user) {
+            ->then(function () use ($connection) {
                 $this->channelManager
                     ->getChannelMembers($connection->app->id, $this->getName())
                     ->then(function ($users) use ($connection) {

src/Statistics/Collectors/MemoryCollector.php

@@ -7,7 +7,6 @@
 use BeyondCode\LaravelWebSockets\Facades\StatisticsStore;
 use BeyondCode\LaravelWebSockets\Helpers;
 use BeyondCode\LaravelWebSockets\Statistics\Statistic;
-use React\Promise\FulfilledPromise;
 use React\Promise\PromiseInterface;
 
 class MemoryCollector implements StatisticsCollector