Version 3.1.9 release notes.
Version 3.1.9 release notes.

scottgonzalez/clean-css,vlajos/clean-css,island205/clean-css,MartyIX/clean-css,yomed/clean-css,GerHobbelt/clean-css,shelsonjava/clean-css,stuht/clean-css,jakubpawlowicz/clean-css