add note about compatibility with ruby 2.0.0 and 2.1.0 in README
add note about compatibility with ruby 2.0.0 and 2.1.0 in README

nh-platform/barnacles,derekprior/lobsters,owen/lobsters,udaysinghcode/projecthunt,harsha-mudi/lobsters,nh-platform/barnacles,miguelcarvajal/lobsters,mojacc/lobsters,saitodisse/lobsters,Denniskevin/lobsters,saitodisse/lobsters,sboklund/munu.co,hlian/barnacles,SIGN-UP/totalitarian.info,owen/lobsters,benrmatthews/servicedesignnews,andyyang/lobsters,STRd6/barnacles,GetStream/lobsters,Bloc/lobsters,buitranquyet/lobsters,miguelcarvajal/lobsters,derekprior/lobsters,Bloc/lobsters,sboklund/munu.co,harsha-mudi/lobsters,harsha-mudi/lobsters,sboklund/munu,ukazap/lobsters,Denniskevin/lobsters,benrmatthews/servicedesignnews,cannikin/lobsters,mojacc/lobsters,buitranquyet/lobsters,andyyang/lobsters,chaica/lobsters,Denniskevin/lobsters,Bloc/lobsters,buitranquyet/lobsters,nh-platform/barnacles,cannikin/lobsters,aaron-lebo/updn,benrmatthews/servicedesignnews,chaica/lobsters,hlian/barnacles,ukazap/lobsters,ABorgna/lobsters,sboklund/munu,owen/lobsters,SIGN-UP/totalitarian.info,STRd6/barnacles,sboklund/munu,cannikin/lobsters,ukazap/lobsters,chaica/lobsters,GetStream/lobsters,chaica/lobsters,derekprior/lobsters,saitodisse/lobsters,aaron-lebo/updn,GetStream/lobsters,calblueprint/bp-news,aaron-lebo/updn,udaysinghcode/projecthunt,sboklund/munu.co,STRd6/barnacles,owen/lobsters,hlian/barnacles,udaysinghcode/projecthunt,buitranquyet/lobsters,mojacc/lobsters,miguelcarvajal/lobsters,hlian/barnacles,cannikin/lobsters,andyyang/lobsters,STRd6/barnacles,derekprior/lobsters,mojacc/lobsters,GetStream/lobsters,ABorgna/lobsters,harsha-mudi/lobsters,calblueprint/bp-news,Denniskevin/lobsters,nh-platform/barnacles,ABorgna/lobsters,SIGN-UP/totalitarian.info,Bloc/lobsters,ukazap/lobsters,calblueprint/bp-news,sboklund/munu.co,aaron-lebo/updn,ABorgna/lobsters,SIGN-UP/totalitarian.info,saitodisse/lobsters,sboklund/munu