Remove the requirement of the "v" tag prefix when generating changelogs
When generating a changelog and not specifying the to
parameter, GitLab will search for the last release's tag. As part of this, it requires that the tag name starts with "v". In #1546 (comment 512288574), a user suggested removing the "v" requirement. This should be easy enough to implement: we still anchor our search to the start of a tag name, but just make "v" optional.