Update README.md

README.md

-jitmeet - a colibri.js sample application
+Jitsi Meet - a colibri.js sample application
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-A WebRTC-powered multi-user videochat. For a live demo, check out either https://meet.estos.de/ or https://meet.jit.si/.
+A WebRTC-powered multi-user videochat. For a live demo, check out either https://meet.jit.si 
 
-Built using [colibri.js](https://github.com/ESTOS/colibri.js) and [strophe.jingle](https://github.com/ESTOS/strophe.jingle), powered by the [jitsi-videobridge](https://github.com/jitsi/jitsi-videobridge)
+Built using Philipp Hancke's colibri.js and strophe.jingle
+
+powered by the [jitsi-videobridge](https://jitsi.org/videobridge