Changelog for nanomsg-1.1.5-2.fc31.x86_64.rpm :

* Thu Jul 25 2019 Fedora Release Engineering - 1.1.5-2- Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
* Mon Feb 18 2019 Troy Dawson - 1.1.5-1- Initial package