Bump to 6.3.0
Bump to 6.3.0

gi11es/thumbor,scorphus/thumbor,marcelometal/thumbor,voxmedia/thumbor,kkopachev/thumbor,kkopachev/thumbor,scorphus/thumbor,okor/thumbor,scorphus/thumbor,marcelometal/thumbor,kkopachev/thumbor,scorphus/thumbor,thumbor/thumbor,okor/thumbor,gi11es/thumbor,gi11es/thumbor,thumbor/thumbor,kkopachev/thumbor,thumbor/thumbor,thumbor/thumbor,marcelometal/thumbor,voxmedia/thumbor,okor/thumbor,voxmedia/thumbor