6.0.0

BREAKING CHANGE: The role now supports the reboot and reboot_command options built into newer dnf versions. Prior to this, the role installed custom systemd units for the reboot feature. For new enough versions of dnf, these will automatically be removed and the built-in reboot feature is used now. For older versions of dnf, the systemd units are still supported. However, the valid options for dnf_automatic_reboot changed! The old values true and false are no longer supported. The new valid values are never, when-needed and when-changed. (The latter two will be considered being enabled for older dnf versions not yet supporting the built-in reboot option) See #16, thanks @AidanRichmond, fixes long open issue #8