No diff link rendered for first release

[mrombout]

When doing the a first release, all items are properly moved from the Unreleased section to the release section. But at the bottom of the page, no diff link is rendered for this release:

# Changelog

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## [Unreleased]

## [v0.0.1] - 2023-04-09

### Added

- Added some new stuff.

### Changed

- Changed an existing feature.

### Deprecated

- Deprecated some old stuff, to be removed in the next release.

### Removed

- Removed some old stuff.

### Fixed

- Fixed some bugs.

### Security

- Security fix for CVE-1234-1234.

[Unreleased]: http://github.com/HEAD...HEAD

Only after the changelog is then modified again (either through a release or adding a new entry) the link is properly rendered and the link is changed to [Unreleased]: http://github.com/v0.0.1...HEAD as it should be.