update license to Apache 2.0
update license to Apache 2.0

phvu/DDF,ddf-project/DDF,ubolonton/DDF,ubolonton/DDF,phvu/DDF,ubolonton/DDF,phvu/DDF,ddf-project/DDF,ddf-project/DDF,milliondreams/ddf-with-flink,phvu/DDF,phvu/DDF,hsaputra/DDF,ddf-project/ddf-flink,hsaputra/DDF,ubolonton/DDF,milliondreams/ddf-with-flink,hsaputra/DDF,hsaputra/DDF,ddf-project/ddf-flink,ubolonton/DDF,ddf-project/DDF,hsaputra/DDF,ddf-project/DDF