code: @CheckReturnValue
      public WebhookManager setChannel(TextChannel channel)
      {
          Checks.notNull(channel, "Channel");
          Checks.check(channel.getGuild().equals(getGuild()), "Channel is not from the same guild");
          this.channel = channel.getId();
          set |= CHANNEL;
          return this;
      }
docs: Sets the {@link net.dv8tion.jda.core.entities.TextChannel TextChannel} of the selected {@link net.dv8tion.jda.core.entities.Webhook Webhook}.
  
  <p>A webhook channel <b>must not</b> be {@code null} and <b>must</b> be in the same {@link net.dv8tion.jda.core.entities.Guild Guild}!
  
  @param  channel
  The new {@link net.dv8tion.jda.core.entities.TextChannel TextChannel}
  for the selected {@link net.dv8tion.jda.core.entities.Webhook Webhook}
  
  @throws net.dv8tion.jda.core.exceptions.InsufficientPermissionException
  If the currently logged in account does not have the Permission {@link net.dv8tion.jda.core.Permission#MANAGE_WEBHOOKS MANAGE_WEBHOOKS}
  in the specified TextChannel
  @throws IllegalArgumentException
  If the provided channel is {@code null} or from a different Guild
  
  @return WebhookManager for chaining convenience