Add Telegram support for notifications

[LeddaZ]

Notifications for updated records will be sent to a Telegram bot

[ddries]

Beast! Amazing work! Thank you very much for your contribution.

May I ask you a minor change to the README? Just to follow the other examples,

token = "<your bot token from BotFather>"
chat_id = "<the ID of the chat to send notifications to>"

to something more like:

token = "aaabbb" # from BotFather
chat_id = "111"

Thank you very much :)!

[ddries]

Ahhh, and maybe put back the three dots in the notification services list?

d2c.sh by default does not use any notification service, but the following are supported and can be enabled:
- [Gotify](https://gotify.net/)
- [Telegram Bot API](https://core.telegram.org/api/bots)
- ...

[ddries]

Thank you LeddaZ, nice work! Just minor changes.

[LeddaZ]

I have updated the README

[ddries]

Nice work! Thank you!