added mention of MapBox Hosting when exporting
added mention of MapBox Hosting when exporting

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