Pmbootstrap release

Checklist for creating a  release:


 * bump pmbootstrap version ( in  )
 * update  to the current one in Alpine Linux (in  )
 * commit with the message "Prepare x.x.x release"
 * create a new tag with
 * look at the previous commits and copy paste the commit message titles, including the MR ID, like done in the previous tags). Sort by features, fixes and other.
 * push your changes:
 * update the pypi release (see the script in )
 * update the pmbootstrap aport in Alpine's aports (change the pkgrel, update the checksum, build; see script below)
 * if future changes in pmaports will require the new pmbootstrap version, increase it in pmaports.git's pmaports.cfg file
 * update the pmbootstrap aport in Alpine's aports (change the pkgrel, update the checksum, build; see script below)
 * if future changes in pmaports will require the new pmbootstrap version, increase it in pmaports.git's pmaports.cfg file

Script to partially automatize the upgrade in Alpine's aports (one still needs to copy over relevant changes to Alpine's aport, but pkgver and checksums are updated automatically):