run_code_generation.py updated comments with 2019 to 2020. Put all date updates into this one CL. This also updated hashes. Bug: angleproject:4262 Change-Id: Ia213dd5e47f155986cbb4161d777724355878af0 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1986994 Commit-Queue: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>
