Collecting quarterly package updates

To collect all mlr3 quarterly package updates, use the code in this gist. The code outputs a file called news-pkgs.md which is sorted alphabetically by package name.

This file needs to be curated a bit:

• Only keep the releases which fall into this period (most often only the latest release)

• Check that all h1 lines have an empty line before (otherwise they won't render)

Next, open a Pull Request in mlr-org/mlr-web and create a new post called "mlr3 package updates - <quarter>/<year>", e.g. "mlr3 package updates - q3/2021". You can orient yourself on the previous posts with respect to a short introduction and general formatting. Each post in our blog will automatically appear on R-Bloggers and RWeekly.