Bot Golang Versions Save

What's Changed

• Add custom http client support by @artemMur in https://github.com/mail-ru-im/bot-golang/pull/23
• ci: update go version by @DmitryDorofeev in https://github.com/mail-ru-im/bot-golang/pull/25
• Add context to client request by @artemMur in https://github.com/mail-ru-im/bot-golang/pull/24

Full Changelog: https://github.com/mail-ru-im/bot-golang/compare/1.3.1...1.4.0

• added markup mode