Update README file with Karaf 3 commands
Update README file with Karaf 3 commands

mcculls/karaf-cellar,3cky/karaf-cellar,apache/karaf-cellar,apache/karaf-cellar,albertocsm/karaf-cellar,3cky/karaf-cellar,albertocsm/karaf-cellar,FlavioF/karaf-cellar,albertocsm/karaf-cellar,FlavioF/karaf-cellar,mcculls/karaf-cellar,FlavioF/karaf-cellar,3cky/karaf-cellar