Add version to Selenium README.
Add version to Selenium README.

paulovieira/tilemill-clima,florianf/tileoven,isaacs/tilemill,paulovieira/tilemill-clima,Teino1978-Corp/Teino1978-Corp-tilemill,paulovieira/tilemill-clima,Zhao-Qi/tilemill,makinacorpus/tilemill,Zhao-Qi/tilemill,nyimbi/tilemill,mbrukman/tilemill,fxtentacle/tilemill,paulovieira/tilemill-clima,mbrukman/tilemill,Zhao-Qi/tilemill,Zhao-Qi/tilemill,tilemill-project/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,nyimbi/tilemill,MappingKat/tilemill,MappingKat/tilemill,makinacorpus/tilemill,MappingKat/tilemill,tizzybec/tilemill,mbrukman/tilemill,nyimbi/tilemill,florianf/tileoven,isaacs/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,fxtentacle/tilemill,tilemill-project/tilemill,tizzybec/tilemill,mbrukman/tilemill,nyimbi/tilemill,fxtentacle/tilemill,mbrukman/tilemill,tizzybec/tilemill,Zhao-Qi/tilemill,tizzybec/tilemill,fxtentacle/tilemill,tizzybec/tilemill,MappingKat/tilemill,isaacs/tilemill,MappingKat/tilemill,fxtentacle/tilemill,paulovieira/tilemill-clima,florianf/tileoven,tilemill-project/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,nyimbi/tilemill