update copyright to MapBox
update copyright to MapBox

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