Use Ruby question mark convention in Shorthand linter
Use Ruby question mark convention in Shorthand linter

Functions that end in a question mark are expected to return boolean
values. This improves the readability of the code a little.

While I was at it, I addressed a couple of minor things in addition,
such as replacing unused arguments with underscores to follow
conventions, and breaking apart a complex conditional that had grown too
long into two separate conditionals to improve readability.

leseulsteve/scss-lint,gatero/scss-lint,davecarter/scss-lint,gajus/scss-lint,ivantsepp/scss-lint,bkeepers/scss-lint,philipgiuliani/scss-lint,chatzipan/scss-lint,baileyparker/scss-lint,dwayhs/scss-lint,ingdir/scss-lint,teoljungberg/scss-lint,cih/scss-lint