Changelog for libcoap-doc-4.2.0-2.fc31.noarch.rpm :

* Thu Jul 25 2019 Fedora Release Engineering - 4.2.0-2- Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
* Sat Mar 02 2019 Peter Robinson 4.2.0-1- Update to 4.2.0 GA stable release
* Sat Feb 09 2019 Peter Robinson 4.2.0-0.1.rc4- Update to 4.2.0 rc4