chore: Update roadmap doc
chore: Update roadmap doc

Issue #2505

Change-Id: I2fe0a879ef6efa60cf8182de0db6dc5892a030e8

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