- Added ability to specify a thread when send messages (thanks to @hazi)
- Fixed proxy ENV support for ruby versions < 2.5.0
- Resolved missing dependencies for development and testing
- Added Card Messages support
- Added YARD documentation
- Added HangoutsChat::Sender::APIError exception for unsuccessful responses
- Added tests
- Improved appearance
- Added and performed rubocop code analyze
- Initial version with Hangouts Chat simple text messages support