Update README.md

Author: clarus

README.md

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 # OPAM website
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 [![Join the chat at https://gitter.im/clarus/coq-opam-website](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/clarus/coq-opam-website?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 Generation of the Coq website for OPAM.
 
 ## Run