fix should add version links

[koppor]

I executed

changelog fix "Fixed ..."

The diff was

 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed ...
+
 ## 1.0.0 - 2021-04-18
 
 Initial public release

There should have been following addition at the end:

+[Unreleased]: https://github.com/koppor/cpdfsqueeze-action/compare/1.0.0...main

The tool should use git to find out the GitHub URL for origin and then "magically" create the URL for the link.

---

Similar for changelog release. The link for the diff could be generated out of previous links.

[NiclasvanEyk]

That's a nice idea. I also like how Tailwind does it, where they make the version number a link to the diff.

However this generates lots of noise when viewing the changeling in the terminal, which I don't really like. So maybe this can be inferred from the existing releases or a global configuration option as a fallback.

[koppor]

However this generates lots of noise when viewing the changeling in the terminal, which I don't really like.

Agree.

So maybe this can be inferred from the existing releases or a global configuration option as a fallback.

Unfortunately, current Markdown handlers are not capable of inferring URLs from other links.

Meaning, if a Markdown parser finds

[1.1.0]: https://github.com/olivierlacan/keep-a-changelog/compare/v1.0.0...v1.1.0

It does not know that 1.1.1 is the link olivierlacan/keep-a-changelog@v1.1.0...v1.1.1.

In addition, the "Keep a Changelog" format also has these links: https://github.com/olivierlacan/keep-a-changelog/blob/d1bdf1fa6ad943d5eb66259609323a9c95516780/CHANGELOG.md?plain=1#L250

(And just having [] surrounding a version number makes the impression of broken Markdown links than a cool syntax. At least for me).