Add 0.4.0 download link for Mac OS X.
Add 0.4.0 download link for Mac OS X.

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