Update cherry-blossom-theme recipe for new github handle

This is sort of silly, but I changed my github username recently. The recipe still works, but it seemed like a good idea to update the reference. 

As far as "proving" that it's still me, you can check that
https://github.com/byels/emacs-cherry-blossom-theme
redirects to
https://github.com/inlinestyle/emacs-cherry-blossom-theme

Thanks!