Update changelog for v2.5.16 and v3.0.4
Update changelog for v2.5.16 and v3.0.4

Change-Id: Ief16eb2b67222c4fea75218d212c911ee0dcd628

shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player