Simplify Revive Adserver licenses (remove *-or-later)

README.md

@@ -1360,7 +1360,7 @@ Software that does not fit in another section.
 - [Readflow](https://readflow.app) - Lightweight news reader with modern interface and features: full-text search, automatic categorization, archiving, offline support, notifications... ([Source Code](https://github.com/ncarlier/readflow)) `MIT` `Go`
 - [ReleaseBell](https://releasebell.com/) - Send release notifications for starred Github repos. ([Source Code](https://git.cloudron.io/cloudron/releasebell)) `MIT` `Nodejs`
 - [revealjs](https://revealjs.com) - Framework for easily creating beautiful presentations using HTML. ([Demo](https://revealjs.com/), [Source Code](https://github.com/hakimel/reveal.js)) `MIT` `Javascript`
-- [Revive Adserver](https://www.revive-adserver.com/) - World's most popular free, open source ad serving system. Formerly known as OpenX Adserver and phpAdsNew. ([Source Code](https://github.com/revive-adserver/revive-adserver)) `GPL-2.0-or-later` `PHP`
+- [Revive Adserver](https://www.revive-adserver.com/) - World's most popular free, open source ad serving system. Formerly known as OpenX Adserver and phpAdsNew. ([Source Code](https://github.com/revive-adserver/revive-adserver)) `GPL-2.0` `PHP`
 - [SANE Network Scanning](http://sane-project.org/) - Allow remote clients to access image acquisition devices (scanners) available on the local host. ([Source Code](http://www.sane-project.org/cvs.html)) `GPL-2.0` `C`
 - [string.is](https://string.is/) - An open-source, privacy-friendly online string toolkit for developers. ([Source Code](https://github.com/recurser/string-is)) `AGPL-3.0` `Nodejs`
 - [Teleport](https://goteleport.com/) - Certificate authority and access plane for SSH, Kubernetes, web applications, and databases. ([Source Code](https://github.com/gravitational/teleport)) `Apache-2.0` `Go`