add 0.3.3 to changelog
add 0.3.3 to changelog

mapbox/mapbox-studio,Zhao-Qi/mapbox-studio-classic,Zhao-Qi/mapbox-studio-classic,mapbox/mapbox-studio,mapbox/mapbox-studio-classic,mapbox/mapbox-studio-classic,mapbox/mapbox-studio-classic,mapbox/mapbox-studio,mapbox/mapbox-studio-classic,Zhao-Qi/mapbox-studio-classic,mapbox/mapbox-studio,Zhao-Qi/mapbox-studio-classic,Zhao-Qi/mapbox-studio-classic,mapbox/mapbox-studio