Remove wrong demo link for diaspora* (#2971)

README.md

@@ -507,7 +507,7 @@ Mailing lists servers and mass mailing software - one message to many recipients
 - [cartulary](https://github.com/daveajones/cartulary) - RSS reader, readability tool, article archiver, microblogger, social graph manager and reading list manager. `CDDL-1.0` `PHP`
 - [Commento](https://gitlab.com/commento/commento) - Commento is a discussion platform that you can embed on your blog, news articles, and any place where you want your readers to add comments. `MIT` `Go`
 - [Coral](https://coralproject.net/) - A better commenting experience from Vox Media. ([Source Code](https://github.com/coralproject/talk)) `Apache-2.0` `Nodejs`
-- [diaspora*](https://diasporafoundation.org/) - Distributed social networking server. ([Demo](https://podupti.me/go.php), [Source Code](https://github.com/diaspora/diaspora)) `AGPL-3.0` `Ruby`
+- [diaspora*](https://diasporafoundation.org/) - Distributed social networking server. ([Source Code](https://github.com/diaspora/diaspora)) `AGPL-3.0` `Ruby`
 - [Discourse](https://www.discourse.org/) - Advanced forum / community solution based on Ruby and JS. ([Demo](https://try.discourse.org/), [Source Code](https://github.com/discourse/discourse)) `GPL-2.0` `Ruby`
 - [dyu comments](https://github.com/dyu/comments) - Real-time, markdown-enabled comment engine powered by leveldb. ([Demo](https://dyu.github.io/comments/real-time/)) `Apache-2.0` `Java`
 - [Elgg](https://elgg.org/) - Powerful open source social networking engine. ([Source Code](https://github.com/Elgg/Elgg)) `GPL-2.0` `PHP`