title: how to prevent spam bots from joining groups in Telegram?
body: <p>I have a group in Telegram that is bombarded by spammers/bots.  We have Shieldy enabled, which gets rid of <em>most</em> of the spammers within a few seconds, but the notifications that come a few times per day get really annoying. There is no setting in the group setting that is able to prevent it.  How can I restrict the group so that only <em>invited</em> people can join the group?</p>