adding support for testing LESS with postcss-less
adding support for testing LESS with postcss-less

gaidarenko/stylelint,gucong3000/stylelint,stylelint/stylelint,stylelint/stylelint,stylelint/stylelint,hudochenkov/stylelint,heatwaveo8/stylelint,hudochenkov/stylelint,gaidarenko/stylelint,stylelint/stylelint,hudochenkov/stylelint,gucong3000/stylelint,evilebottnawi/stylelint,heatwaveo8/stylelint,gaidarenko/stylelint,evilebottnawi/stylelint,gucong3000/stylelint,heatwaveo8/stylelint