Readme jsdelivr.net links are missing "http:"
Like title says, the CSS links don't work because they're missing "http:" at the beginning.  It took me a little while to figure out why I couldn't get even a basic example working =)

Current:
<link href="//cdn.jsdelivr.net/npm/keyrune@latest/css/keyrune.css" rel="stylesheet" type="text/css" />

Should be:
<link href="http://cdn.jsdelivr.net/npm/keyrune@latest/css/keyrune.css" rel="stylesheet" type="text/css" />