Update changelog for v2.2.7
Update changelog for v2.2.7

Change-Id: I427fb17ff7de1ff1ee3d5be95e02947b0b44a29e

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