rt-shell 4.1.0 released!

rt-shell 4.1.0 is a minor release with some community-driven fixes and improvements!

#45 : autocomplete is now case-insensitive (thanks @WangleLine for the fix)
#47 : autocomplete suggestions can now be navigated with up/down arrow keys (thanks @WangleLine for the fix)
empty commands no longer print an error message (thanks @bfrymire for the fix)

Big thanks to our contributors for this release!