bumped version to 0.8.3.1.
bumped version to 0.8.3.1.

zzak/rake,utilum/rake,mat/rake,hsbt/rake,bentley/rake,taiganakagawa/rake,tmornini/rake,ruby/rake,pivotalforks/rake,pjump/rake,codedogfish/rake,envato/rake,hsbt/rake,askl56/rake,jaustinhughey/rake,mat/rake,88rabbit/rake,pivotalforks/rake,Vanzct/rake,esasse/rake,ruby/rake,envato/rake,ipmobiletech/rake