git: openjdk/shenandoah-visualizer: master: Update README again

[duke]

Changeset: 9cf52799
Author:    Aleksey Shipilev <shade at redhat.com>
Date:      2020-11-16 19:32:15 +0000
URL:       https://github.com/openjdk/shenandoah-visualizer/commit/9cf52799

Update README again

! README.md