Rename Calendso to Cal.com (#2941)

README.md

@@ -226,7 +226,7 @@ _See also: [WeblogMatrix](https://www.weblogmatrix.org/)_
 _Related: [Polls and Events](#polls-and-events)_
 
 - [Alf.io](https://alf.io/) - The open source ticket reservation system. ([Demo](https://demo.alf.io/authentication), [Source Code](https://github.com/alfio-event/alf.io)) `GPL-3.0` `Java`
-- [Calendso](https://calendso.com/) - The open-source online appointment scheduling system. ([Demo](https://app.calendso.com/bailey), [Source Code](https://github.com/calendso/calendso)) `MIT` `Nodejs`
+- [Cal.com](https://cal.com/) - The open-source online appointment scheduling system. ([Demo](https://app.cal.com/bailey), [Source Code](https://github.com/calcom/cal.com)) `MIT` `Nodejs`
 - [Easy!Appointments](https://easyappointments.org/) - A highly customizable web application that allows your customers to book appointments with you via the web. ([Demo](https://easyappointments.org/demo/), [Source Code](https://github.com/alextselegidis/easyappointments)) `GPL-3.0` `PHP`