Add rules for RKWard mailing lists.

Note that commit notifications were already going to rkward-tracker, before the switch to gitlab.

Discussion on the lists (identical mail):
- https://mail.kde.org/pipermail/rkward-devel/2020-September/005505.html
- https://mail.kde.org/pipermail/rkward-tracker/2020-September/009098.html
parent f8a04197
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