Add an ability to download files sent by user #406
Description
Hello, guys. Maybe I missed something but i can't find any methods to download files (for example which I get from DocumentMessage update). But default Tg API has endpoint to do this (https://api.telegram.org/file/bot/<file_path>). You also mentioned this endpoint in your scaladoc comments for method GetFile. I think it would be nice to have a method to easily load data from chat