@util hr - should be able to pass 0-4 parameters without any warnings

[freddyroberts]

Hi - Thanks for the helpful plugin!

I believe i've discovered a bug with @util hr;

As per the documentation, 4 parameters can be passed to the hr utility. This works as expected as far as functionality.

The Issue:
I'm currently getting a warning in the build output when I pass only one param or when I pass more than 2 params.

It seems that the issue lies in the walkAtRules function in index.js

Solution: Regarding @util hr;, based on documentation, you should be able to pass 0-4 parameters with out any warnings.