Improve README
Improve README

mcanthony/sass-loader,Updater/sass-loader,jtangelder/sass-loader,bebo/sass-loader,bholloway/sass-loader,jorrit/sass-loader,Updater/sass-loader,stevemao/sass-loader,bholloway/sass-loader,jtangelder/sass-loader,stevemao/sass-loader,bebo/sass-loader,jorrit/sass-loader,mcanthony/sass-loader