Chunk members from all guilds

Check the `member_count` property given by Discord. If it is less than
the repository count, attempt to chunk the members

src/Discord/WebSockets/Events/GuildCreate.php

@@ -34,6 +34,7 @@ public function handle(Deferred &$deferred, $data)
             return $deferred->promise();
         }
 
+        /** @var Guild */
         $guildPart = $this->factory->create(Guild::class, $data, true);
         foreach ($data->roles as $role) {
             $role = (array) $role;
@@ -81,7 +82,7 @@ public function handle(Deferred &$deferred, $data)
         }
 
         $resolve = function () use (&$guildPart, $deferred) {
-            if ($guildPart->large) {
+            if ($guildPart->large || $guildPart->member_count > $guildPart->members->count()) {
                 $this->discord->addLargeGuild($guildPart);
             }