v4.2

Changed

Two performance improvements

• Use the builtin command --search instead of which, which is much faster and removes a dependency. (#32)
• Use the test builtin repeatedly instead of ls -o -d to get file types in order to preview files, which is an order of magnitude faster (#33)

Three readability improvements

• Format readme with prettier and use reference links (#34)
• Convert license to markdown, which makes it more fun to read when clicked on in GitHub (#35)
• When defining functions, put arguments first before description (87cf0d4)

BIG thanks to @IlanCosman for introducing all these changes.