Consider sorting other types of enums?

[zachbryant]

I'm finalizing my branch before PR for #26 and I noticed the linter works just fine on other kinds of enums. For example, the test case enum U {c=1<<1, b, a} has no special work required to sort. Is there a specific reason to only sort string enums? If not, I'd propose changing the rule to just enum instead of string-enum.

I figured something such as changing rule names should be part of a major version change, might as well lump it in with the same PR

[infctr]

Hey, @zachbryant
Thank you for your time and effort working on the issue!
Let's add a new rule for that matter to make it backwards compatible, WDYT?

[zachbryant]

Sounds good to me