Update tomboy to 1.15.5. From the upstream changelog:
Updates may require up to 24 hours to propagate to mirrors. If the following command doesn't work, please retry later:
sudo dnf upgrade --refresh --advisory=FEDORA-2016-1653dcfd44
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This update has been submitted for testing by thm.
This update has been pushed to testing.
This update has reached 7 days in testing and can be pushed to stable now if the maintainer wishes
This update has been submitted for stable by thm.
This update has been pushed to stable.