[Sass] Add a changelog entry for the Sass::Plugin improvements.
[Sass] Add a changelog entry for the Sass::Plugin improvements.

I feel stupid for not adding this before the beta 2 release.

nickg33/sass,uniba/hamldoc_ja,macressler/haml,rammy7219/sass,baiyanghese/sass,OrenBochman/sass,Ahnita/sass,JuanitoFatas/sass,concord-consortium/haml,liquidmetal/sass,Industrys/sass,Iamronan/sass,hcatlin/sass,Ahnita/sass,nicklima/sass,14113/sass,modulexcite/sass,PMArtz92/sass,srinivashappy/sass,Andrey-Pavlov/sass,haml/haml,haml/haml,nazar-pc/haml,lmetla/sass,nickg33/sass,tangposmarvin/haml,zaru/sass,Anshdesire/sass,haml/haml,dg1dd1ngs/haml,Galactix/sass,HugoRLopes/sass,oss-practice/sass,Anshdesire/sass,modulexcite/sass,saper/sass,briangonzalez/sass,amatsuda/haml,stanhu/haml,cmpereirasi/sass,Iamronan/sass,stewx/sass,schneems/sass,srinivashappy/sass,chriseppstein/haml,antonifs/sass,tangposmarvin/sass,amitsuroliya/sass,nicklima/sass,zaru/sass,PMArtz92/sass,danielfein/sass,xzyfer/sass,saper/sass,hcatlin/sass,chriseppstein/sass,StephanieMak/sass,tangposmarvin/haml,Andrey-Pavlov/sass,xzyfer/sass,JuanitoFatas/sass,macressler/haml,keithpitty/haml,schneems/sass,danielfein/sass,rammy7219/sass,Industrys/sass,Galactix/sass,DanteKaris/sass,amitsuroliya/sass,ridixcr/sass,jaroot32/sass,StephanieMak/sass,srawlins/sass,HugoRLopes/sass,haml/haml,dg1dd1ngs/haml,lmetla/sass,tangposmarvin/sass,dylannnn/sass,cmpereirasi/sass,askl56/sass,chriseppstein/haml,tenderlove/sass,Nzaga/sass,keithpitty/haml,OrenBochman/sass,nazar-pc/haml,dylannnn/sass,stewx/sass,antonifs/sass,MetaAshley/sass,askl56/sass,DanteKaris/sass,jaroot32/sass,ridixcr/sass,sideci-sample/sideci-sample-haml,srawlins/sass,stanhu/haml,liquidmetal/sass,Nzaga/sass,MetaAshley/sass