Hi Daniel,
The current version for Relative Pro is 2.1.1.
I verified our download version in WordPress, which is connected to your theme in your WordPress, and saw that it was accidentally set to 2.1.2, thus alerting you and our clients of a new update. I apologise for this inconvenience and I thank you for reporting this!
I modified it back to 2.1.1 and you should no longer receive a notification alert. If it is still there, access the theme page again, clear your cache, or attempt the update again and the notification should be removed.
Have a wonderful day.