Synchronise versions.md with the 1.3.x branch copy.
Synchronise versions.md with the 1.3.x branch copy.

BenJenkinson/nodatime,zaccharles/nodatime,zaccharles/nodatime,zaccharles/nodatime,nodatime/nodatime,jskeet/nodatime,zaccharles/nodatime,zaccharles/nodatime,malcolmr/nodatime,jskeet/nodatime,nodatime/nodatime,BenJenkinson/nodatime,zaccharles/nodatime,malcolmr/nodatime,malcolmr/nodatime,malcolmr/nodatime