fix: update kyela demo url

README.md

@@ -1101,7 +1101,7 @@ See also _[Monitoring](#monitoring)_
 - [dudle](http://primelife.ercim.eu/results/opensource/63-dudle) - Online scheduling application. ([Demo](https://dudle.inf.tu-dresden.de/), [Source code](https://github.com/kellerben/dudle)) `AGPL-3.0` `Ruby`
 - [Fider](http://getfider.com) - Open source alternative to UserVoice for customer feedback. ([Demo](https://demo.fider.io), [Source Code](https://github.com/getfider/fider)) `MIT` `Go`
 - [Framadate](https://framadate.org/) - Online service for planning an appointment or make a decision quickly and easily: Make a poll, Define dates or subjects to choose, Send the poll link to your friends or colleagues, Discuss and make a decision. ([Demo](https://framadate.org/aqg259dth55iuhwm), [Source Code](https://git.framasoft.org/framasoft/framadate)) `CECILL-B` `PHP`
-- [Kyélà](http://kyela.net/) - Participation polls for group events. ([Demo](http://kyela.net/55232734237c8/), [Source Code](https://github.com/abienvenu/Kyela)) `AGPL-3.0` `PHP`
+- [Kyélà](http://kyela.net/) - Participation polls for group events. ([Demo](https://kyela.net/concert/), [Source Code](https://github.com/abienvenu/Kyela)) `AGPL-3.0` `PHP`
 - [LimeSurvey](https://www.limesurvey.org) - Feature-rich Open Source web based polling software. Supports extensive survey logic. ([Demo](https://demo.limesurvey.org), [Source code](https://github.com/LimeSurvey/LimeSurvey)) `GPL-2.0` `PHP`
 - [Nuages](https://nuages.domainepublic.net/) - Collaborative meeting poll system, similar to doodle or rdvz. ([Source Code](http://git.domainepublic.net/?p=nuages.git;a=tree)) `GPL-3.0` `Python`
 - [PHPBack](http://www.phpback.org) - The open source feedback system. ([Demo](http://www.phpback.org/demo/), [Source Code](https://github.com/ivandiazwm/phpback)) `GPL-3.0` `PHP`