Changelog for R-callr-2.0.3-1.fc26.x86_64.rpm :

* Thu Apr 26 2018 Elliott Sales de Andrade - 2.0.3-1- Update to latest version
* Thu Mar 22 2018 Elliott Sales de Andrade - 2.0.2-2- Remove extra Requires
* Wed Mar 21 2018 Elliott Sales de Andrade - 2.0.2-1- initial package for Fedora