remove double link

Signed-off-by: Christian Dietrich <christian.dietrich@itemis.de>

README.md

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 [Eclipse Chat](https://chat.eclipse.org/#/room/#xtext:matrix.eclipse.org)
 
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-https://chat.eclipse.org/#/room/#xtext:matrix.eclipse.org
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 # Eclipse Xtext™
 
 Eclipse Xtext is a framework for the development of programming languages and [domain-specific languages](https://en.wikipedia.org/wiki/Domain-specific_language). It covers all aspects of a complete language infrastructure, from parser, over linker, compiler, or interpreter to fully-blown top-notch IDE integration for Eclipse and Web-based IDEs. Further, languages developed with Xtext can be integrated into editors supporting the [Language Server Protocol](https://github.com/Microsoft/language-server-protocol) (e.g. [VS Code](https://code.visualstudio.com/), [Eclipse Che](https://www.eclipse.org/che/)). Xtext comes with great defaults for all the necessary services. At the same time these can be easily tailored to your individual needs.