The Plugin command was silently removed without being mentioned in the user visible changes list.**
Also the Bash and Zsh command line completion scripts weren't updated to remove it as an option.
Am left wondering how to install swank-clojure now that their simple install guide no longer works?
** EDIT: Was actually well explained @ https://github.com/technomancy/leiningen/wiki/Upgrading
Update news and bash/zsh completion scripts. Fixes #437.