add note about more image filters for resampling being available
add note about more image filters for resampling being available

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