Set Change History entry date, and update version year to 2022.
Set Change History entry date, and update version year to 2022.

Signed-off-by: Daira Hopwood <cd7d43d5556a38ce626d53826fddc46adc597539@jacaranda.org>

zcash/zips,zcash/zips,zcash/zips,zcash/zips