According to https://quiterss.org/, version 0.18.5 is available.
quiterss-0.18.8-1.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-677fc2e299
*** Bug 1470231 has been marked as a duplicate of this bug. ***
quiterss-0.18.8-1.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-677fc2e299
quiterss-0.18.8-1.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.