Click-command-tree

What's Changed
* Use github actions for test matrix by whwright in https://github.com/whwright/click-command-tree/pull/11
* update test matrix by whwright in https://github.com/whwright/click-command-tree/pull/13
* feat: strip and truncate doc strings by whwright in https://github.com/whwright/click-command-tree/pull/14


**Full Changelog**: https://github.com/whwright/click-command-tree/compare/1.1.1...1.2.0

- Exclude `hidden` commands from output https://github.com/whwright/click-command-tree/pull/9

- Add command docs to output