Add support for sending messages to channels

[emilyalbini]

Yesterday Telegram added support for channels in the API, so this should be implemented in botogram.

But I don't want to push changes without the ability to test them, and currently no Telegram client supports marking a bot as administrator of a channel.
Now that all the major clients supports adding bots as channel administrators, this can be implemented. The Bot.send method should be fairly easy to fix, but I also want to add an API for the ones who just want to manage the channel.

This is because creating a bot instance just for sending a message to a channel, maybe in an big script, is just a waste of resources. So I designed this API:

import botogram

chan = botogram.channel("@channel_name", "12345678:api_key")
chan.send("Hi there!")

botogram.channel will return an instance of botogram.Chat, so it won't trigger the initialization of the bot instance.

• Design the API
• Wait for Telegram clients to support this
• Do the actual implementation
• Write a chapter in the documentation

[emilyalbini]

Updated the issue with an API design.

[emilyalbini]

Merged two days ago.