1.9.1

Bugfixes

• Add missing collection arg to "Previous history" link (#131) and to bugreport link
• Fix requires on koschei-common-copr
• Don't assume resolution change existence
• Fix history table layout

Other

• Split resolver service into build_resolver and repo_resolver. Old resolver
  service is still available
• rpmvercmp optimization
• Collection ordering was reversed

Upgrading from 1.9.0

• [optional] You can switch from using resolver service to
  split services - repo-resolver and build-resolver. You can do that by
  stopping and disabling koschei-resolver service and enabling and starting
  koschei-build-resolver and koschei-repo-resolver
• Database migration
  • Run alembic -c /usr/share/koschei/alembic.ini upgrade head while the
    backend services and httpd are stopped