Adjust site links

Co-Authored-By: Sandro <sandro.jaeckel@gmail.com>

README.md

@@ -418,7 +418,7 @@ _[SIP](https://en.wikipedia.org/wiki/Session_Initiation_Protocol)/[IPBX](https:/
 - [Ostel](https://dev.guardianproject.info/projects/ostel/wiki/Server_Documentation) - Secure SIP telephony setup with ZRTP encryption. `GPL-3.0` `Ruby`
 - [Routr](https://routr.io) - A lightweight sip proxy, location server, and registrar for a reliable and scalable SIP infrastructure. ([Demo](https://demo.routr.io/login), [Source Code](https://github.com/fonoster/routr)) `MIT` `JavaScript`
 - [SipXcom](http://sipxcom.org/) - Open source unified communications system. ([Source Code](https://github.com/sipXcom/sipxecs)) `AGPL-3.0` `Java`
-- [SIP3](http://www.sip3.io/) - VoIP troubleshooting and monitoring platform. ([Demo](https://demo.sip3.io), [Source Code](https://github.com/sip3io/)) `Apache-2.0` `Kotlin`
+- [SIP3](https://sip3.io/) - VoIP troubleshooting and monitoring platform. ([Demo](https://demo.sip3.io), [Source Code](https://github.com/sip3io/)) `Apache-2.0` `Kotlin`
 - [Wazo](http://wazo-platform.org/) - Full-featured IPBX solution built atop Asterisk with integrated Web administration interface and REST-ful API. ([Source Code](https://github.com/wazo-platform)) `GPL-3.0` `Python`
 
 ### Social Networks and Forums