Reflect supported ruby version in gemspec
Reflect supported ruby version in gemspec

maxmeyer/aruba,dg-ratiodata/aruba,AdrieanKhisbe/aruba,jasnow/aruba,ducthanh/aruba,ducthanh/aruba,ducthanh/aruba,AdrieanKhisbe/aruba,jasnow/aruba,weedySeaDragon/aruba,cucumber/aruba,weedySeaDragon/aruba,weedySeaDragon/aruba,maxmeyer/aruba,jasnow/aruba,mvz/aruba,AdrieanKhisbe/aruba,mvz/aruba,weedySeaDragon/aruba,dg-ratiodata/aruba,dg-ratiodata/aruba,dg-ratiodata/aruba,jasnow/aruba,AdrieanKhisbe/aruba,ducthanh/aruba