This is a preview release intended for contributors to validate that new functionality works for all supported editors: VS Code, Atom, Vim, Emacs and Sublime Text.
To help test the new features, please see #598 (comment) and comment in the discussion if something is working or not working for your.
For regular users, please wait until v0.5.0 stable is out before upgrading. The website has not yet been updated to document the latest features.