Upstream:   https://github.com/apjanke/ronn-ng
Maintained: https://salsa.debian.org/ruby-team/ruby-ronn
Package:    https://github.com/nabijaczleweli/ronn.deb

Previously: Update from the current Salsa HEAD at 0.8.0-3 to 0.9.0,
fixing https://bugs.debian.org/928627.

Submitted to the maintainer: https://bugs.debian.org/953198.

0.9.0 (with my patches) was accepted into experimental on Wed, 08 Apr 2020 11:20:27 +0200:
https://tracker.debian.org/news/1116879/accepted-ruby-ronn-090-1exp1-source-into-experimental
along with a nice e-mail from the maintainer; thanks!

Update from the current Salsa HEAD at 0.9.0-1~exp1 to 0.9.1.