Update README.md

Author: skurfuerst

README.md

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 This is the 2nd generation of a Two-Stack CMS package for Neos.
 
-**This Package is currently work-in-progress and heavily developed right now. It is
-not yet ready for general usage, but will be soon.**
+**This Package is used in production in a bigger instance.**
 
 The Content Store package is one part of a [Two-Stack CMS](https://martinfowler.com/articles/two-stack-cms/)
 solution with Neos. A Two-Stack architecture separates editing and publishing