Support hsl(0deg, 100%, 50%)

[tribela]

This pr add support hsl(0deg, 100%, 50%);

[ap]

Thank you for the patch. I’ve pushed it as faa6593.

Properly supporting deg values needs more work because the patch as is makes the plugin accept nonsense like rgb(30deg,30deg,30deg). But the plugin is no longer fully up to date with CSS specs anyway, and the changes needed to make it compliant will be much bigger than just a few tweaks to this patch. So I decided to file #193 for those changes and to take your patch as is in the meantime.

Thank you for providing it and for prompting me to check the plugin against at the current state of the specs.