Tackle bot attacks by preventing them to gain invite link

[aaqaishtyaq]

With the recent increase in bot/spam attacks to the telegram group, there is no way we can secure the group.
One idea might be instead of giving the invite link let the user deal with PyDelhi bot first.
A new user clicks the join link greeted by PyDelhi bot, then the bot will ask a very easy question to the user which then pass an invite link with inline button, which is default hiding link behind the text.

For example, you give your user a link like t.me/bot?start=invite, and when your bot received /start invite_link, which ask a question in and send a message with an inline button with URL parameter.

I know this would be a step backward in terms of UX but worth it.

[realslimshanky]

We're removing invite link altogether for now until we reach a solution. Ref: #13