It's been noted that although there have been several releases in the past three years, there haven't been any blog posts about them.
This is mostly a matter of not having enough time... and releases coming reasonably thick and fast, particularly if you include all the patch releases. (These are usually due to TZDB updates.)
While this blog remains "alive" (I'm not closing it) I don't intend to write a new blog post for each release. You can look at NuGet for releases, or the version history on the web site (which I do keep up to date).
Any further blog posts here are likely to be for other reasons - either in terms of the project's future (e.g. if we were to join the .NET Foundation) or interesting aspects about the project that wouldn't be better served on my regular code blog.