demget

Looks much better than #625, thank you. This is going to be merged.

@davseby am I right that your changes should fix #584?

Related to #222

I don't really like the idea of pasting the context everywhere by default, it's not that useful for small single bots, and we **must** keep the backward compatibility. It would...

@MikhailChe @AH-dark do you have any solid examples of using the forked telebot versions with `context.Context` included?

It may make sense in some complicated cases with tons of incoming requests. However, would be interesting to check out the benchmarks to see the difference.