v0.0.21

Changelog

84e978b Update README.md
3db054a add 'version' field to config
563f145 add homebrew integration, refactor goreleaser config
aee2411 add release command and update doc
88c8b5b add short version for lets
0d54658 add tests for config version
03a94da add version to docs, change dev version when build-and-install
77fccea improve error messages when command parse has failed
02b8e24 sue go mod download to preserve go deps in docker image
385c3cb validate config version and lets version