Anki add-on: RH copy 2 (outdated)

IMPORTANT: This is an outdated re-upload of Review Heatmap. Please download the official version here: https://ankiweb.net/shared/info/1771074083 This listing (which was originally uploaded by a different user) is kept up for the time being to redirect and migrate people to the official upload. It will be removed in the future. – Glutanimate