Release today

Signed-off-by: Michal Čihař <michal@cihar.com>
Distribute README.md as well

Signed-off-by: Michal Čihař <michal@cihar.com>
Include forgotten file

Signed-off-by: Michal Čihař <michal@cihar.com>
Ignore tarballs

Signed-off-by: Michal Čihař <michal@cihar.com>
Enable xz release

Signed-off-by: Michal Čihař <michal@cihar.com>