Update README.md

README.md

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 # PeerJS: Simple peer-to-peer with WebRTC #
 
-### tg://join?invite=ENhPuhTvhm8WlIxTjQf7Og
+### https://t.me/joinchat/ENhPuhTvhm8WlIxTjQf7Og
 
 [![Backers on Open Collective](https://opencollective.com/peer/backers/badge.svg)](#backers)
  [![Sponsors on Open Collective](https://opencollective.com/peer/sponsors/badge.svg)](#sponsors)