code: @CheckReturnValue
      public ChannelAction setSlowmode(int slowmode)
      {
          Checks.check(slowmode <= 120 && slowmode >= 0, "Slowmode must be between 0 and 120 (seconds)!");
          this.slowmode = slowmode;
          return this;
      }
docs: Sets the slowmode value, which limits the amount of time that individual users must wait
  between sending messages in the new TextChannel. This is measured in seconds.
  
  <p>Note that only {@link net.dv8tion.jda.core.AccountType#CLIENT CLIENT} type accounts are
  affected by slowmode, and that {@link net.dv8tion.jda.core.AccountType#BOT BOT} accounts
  are immune to the restrictions.
  <br>Having {@link net.dv8tion.jda.core.Permission#MESSAGE_MANAGE MESSAGE_MANAGE} or
  {@link net.dv8tion.jda.core.Permission#MANAGE_CHANNEL MANAGE_CHANNEL} permission also
  grants immunity to slowmode.
  
  @param  slowmode
  The number of seconds required to wait between sending messages in the channel.
  
  @throws IllegalArgumentException
  If the {@code slowmode} is greater than 120, or less than 0
  
  @return The current ChannelAction, for chaining convenience