Added v0.4.0 changelog
Added v0.4.0 changelog

Sygmei/ObEngine,Mizugola/ObEngine,Zarakichi/ObEngine,Mizugola/ObEngine,Mizugola/MeltingSaga,Mizugola/MeltingSagaEngine,Zarakichi/ObEngine,Zarakichi/ObEngine,Sygmei/ObEngine,Mizugola/MeltingSagaEngine,Mizugola/MeltingSaga