Use `mvn` (instead of `curl`) to install Scala
Use `mvn` (instead of `curl`) to install Scala

Was going to just update the URL, but this should be much more robust
against changes.

benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles