Update changelog for v2.2.1
Update changelog for v2.2.1

Change-Id: I2239a4991f5a7af1bbd193ef2030b863f1106afb

TheModMaker/shaka-player,vimond/shaka-player,vimond/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player,shaka-project/shaka-player,TheModMaker/shaka-player,vimond/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player