gruntjs/grunt-contrib-imagemin — pull request #232 by jakub-klapka (2014-07-01 16:09:05+00:00)
Title: Fixed bug with progressive parameter passing to jpegtran

Options to jpegtran were passed as jpegtran(true) insted of jpegtran({progressive: true}), which made progressive parameter unusable and even default setting was not working correctly.