Changelog for python3-oslo-serialization-2.20.0-2.fc28.noarch.rpm :

* Fri Feb 09 2018 Fedora Release Engineering - 2.20.0-2- Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
* Fri Aug 11 2017 Alfredo Moralejo 2.20.0-1- Update to 2.20.0