There is "url://example.com" in your copyright file. This was most likely a remnant from the dh_make template.
Make sure you include the real location where you obtained the upstream sources (if any).
For more information please consult:
- Copyright information (Section 12.5) in the Debian Policy Manual
The tag is present in Lintian version
That is the most recent version we know about.
We use semantic versions.
The patch number is a commit step indicator relative to the
release tag in our Git
You can find the detection logic for this version at commit ca97c3a. For merge requests, please use the latest version in the Lintian check debian/copyright.