Reimplemented immutability into GuildImpl's getTextChannels(), getVoiceChannels() and getRoles().
Reimplemented immutability into GuildImpl's getTextChannels(), getVoiceChannels() and getRoles().

Java-Discord-Bot-System/JDA,DV8FromTheWorld/JDA,Xevryll/JDA,LAX1DUDE/JDA,mentlerd/JDA,Almighty-Alpaca/JDA,DV8FromTheWorld/JDA