git: openjdk/shenandoah-visualizer: master: Rename .hgignore -> .gitignore

[duke]

Changeset: 25d5c06d
Author:    Aleksey Shipilev <shade at redhat.com>
Date:      2020-11-16 19:35:30 +0000
URL:       https://github.com/openjdk/shenandoah-visualizer/commit/25d5c06d

Rename .hgignore -> .gitignore

= .gitignore