fix hash
version 1.6.9 is not released, so use revision hash
add a comment to the rev about why we are not using `v${version}` anymore
use unstable-2020-10-25
update version, not revision
fix hash
version 1.6.9 is not released, so use revision hash
add a comment to the rev about why we are not using `v${version}` anymore
use unstable-2020-10-25