Support for DNF5

Fixed a bug with --quiet

Fixed a bug when no ```$HOME''' is defined

Fixed RPM dependencies

Improved the documentation of --boot-check

If the kernel version is critical and the updates are only a warning the exit code will be critical

Removed up2date support

Adding bash completion to the Makefile and RPM

Removed a test message in the OK output

Adds --assumeyes to allow the import of GPG keys