Update README for release 3.0.2
Update README for release 3.0.2

EsotericSoftware/kryo,childRon/kryo,tomdkt/kryo,mikee805/kryo,doubleyoung/kryo,EsotericSoftware/kryo,irudyak/kryo,magro/kryo,irudyak/kryo,hierynomus/kryo,xfrendx/kryo,childRon/kryo,hierynomus/kryo,xfrendx/kryo,mikee805/kryo,magro/kryo,tomdkt/kryo,doubleyoung/kryo,EsotericSoftware/kryo,EsotericSoftware/kryo