Fix: ShardedClients not pushing PresenceUpdates (#2219)

src/Discord.Net.WebSocket/DiscordShardedClient.cs

@@ -449,6 +449,7 @@ namespace Discord.WebSocket
             client.UserBanned += (user, guild) => _userBannedEvent.InvokeAsync(user, guild);
             client.UserUnbanned += (user, guild) => _userUnbannedEvent.InvokeAsync(user, guild);
             client.UserUpdated += (oldUser, newUser) => _userUpdatedEvent.InvokeAsync(oldUser, newUser);
+            client.PresenceUpdated += (user, oldPresence, newPresence) => _presenceUpdated.InvokeAsync(user, oldPresence, newPresence);
             client.GuildMemberUpdated += (oldUser, newUser) => _guildMemberUpdatedEvent.InvokeAsync(oldUser, newUser);
             client.UserVoiceStateUpdated += (user, oldVoiceState, newVoiceState) => _userVoiceStateUpdatedEvent.InvokeAsync(user, oldVoiceState, newVoiceState);
             client.VoiceServerUpdated += (server) => _voiceServerUpdatedEvent.InvokeAsync(server);