Don't apply hover utilities on focus

I thought this was a good idea at first but in practice it feels wrong.
Not totally opposed to it, but I couldn't really find any other sites
that apply a button's hover state on focus for example.

src/lib/substituteHoverableAtRules.js

@@ -11,8 +11,7 @@ export default function(options) {
         // or weird compound selectors like .bg-blue>p>h1
         rule.selectors =  [
           rule.selector,
-          `.hover\\:${rule.selector.slice(1)}:hover`,
-          `.hover\\:${rule.selector.slice(1)}:focus`
+          `.hover\:${rule.selector.slice(1)}:hover`
         ]
       })