feat(version upgrade): Make 'pkgctl version upgrade' also updates checksums
This MR aims to make pkgctl version upgrade
also updates checksums in addition of bumping the pkgver and resetting the pkgrel.
pacman-contrib
thus becomes a dependency for pkgctl version upgrade
as well, this MR also modifies documentation accordingly.
I also allowed myself to add that pacman-contrib is also needed for the '--pkgver=PKGVER' option in the documentation, as it actually is.
Edited by Robin Candau