Update readme

Signed-off-by: Ben Sherman <bentshermann@gmail.com>

Author: bentsherman

README.md

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 # Nextflow Language Server
 
-A [language server](https://microsoft.github.io/language-server-protocol/) for [Nextflow](https://nextflow.io/) scripts and config files.
+The official [language server](https://microsoft.github.io/language-server-protocol/) for [Nextflow](https://nextflow.io/) scripts and config files.
 
 The following language features are currently supported: