Refresh README for 4.0 [DATACOUCH-553]

**[Michael Nitschinger](https://jira.spring.io/secure/ViewProfile.jspa?name=daschl)** opened **[DATACOUCH-553](https://jira.spring.io/browse/DATACOUCH-553?redirect=false)** and commented

The main README is outdated and needs to be updated for 4.0


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No further details from [DATACOUCH-553](https://jira.spring.io/browse/DATACOUCH-553?redirect=false)