Include code changes in release notes

[dideler]

We currently have release notes under our releases page, which is great for the average user. But technical users are also interested in the source changes, which we don't cover well at the moment. We should start including a commit range in every release. We can backfill existing releases.

Normally such stuff would live in a CHANGELOG. But I'm hesitant to add a CHANGELOG in addition to the Releases because it creates more process by having to put release notes in two places. If we do decide to have a CHANGELOG, one option is to keep it empty and have it link to the Releases.

[dideler]

Started updating Releases using a comparison between tags such as https://github.com/dideler/toggle-youtube-comments/compare/<old-tag>...<new-tag>

Have to head out for a bit, still have a few more to go before we can close this ticket.

[dideler]

Backfilled the change comparison on all Releases.

Note the comparisons for the first two releases did not play well with tags, so had to use commit SHAs instead.

[1natsu172]

Great work! And thanks!
Although I couldn't think of it, tag comparison is a very good solution! 👍