Describe your environment

• Operating system: Ubuntu 18.04
• Python Version: 3.6.9
• CCXT version: 1.30.48 (pip freeze | grep ccxt)
• Freqtrade Version: 2020.6 (freqtrade -V or docker-compose run --rm freqtrade -V for Freqtrade running in docker)

Note: All issues other than enhancement requests will be closed without further comment if the above template is deleted

Summary

Fixed Bad Request: unsupported parse_mode error due to missing prepare_parse_mode line

Do I have to cover this case by tests? If not, then you can mark it as ready for review and merge this

https://github.com/brussens/yii2-maintenance-mode

In terms of Telegram bot API the maximum polling time of getUpdates is referred to as timeout. That is if there are pending updates, Telegram will return them immediately. In the other case, it will wait for timeout seconds and then answer with an empty list.

The telegram-bot Rust library has its own notion of timeouts. getUpdates' timeout [i