Update roadmap doc

NOTRY=true

Bug: skia:
Change-Id: I6cada081caaf54442a50c0b0e7ab27dbd6ae2512
Reviewed-on: https://skia-review.googlesource.com/95102
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Heather Miller <hcm@google.com>
1 file changed