Added section on required JDK versions
Added section on required JDK versions

belaban/JGroups,Sanne/JGroups,TarantulaTechnology/JGroups,danberindei/JGroups,dimbleby/JGroups,TarantulaTechnology/JGroups,Sanne/JGroups,TarantulaTechnology/JGroups,pruivo/JGroups,belaban/JGroups,rhusar/JGroups,danberindei/JGroups,Sanne/JGroups,pferraro/JGroups,dimbleby/JGroups,rhusar/JGroups,dimbleby/JGroups,belaban/JGroups,pferraro/JGroups,pferraro/JGroups,pruivo/JGroups,rhusar/JGroups,pruivo/JGroups,danberindei/JGroups