Update README.md

Author: gnongsie

README.md

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-# .NET Standard Client SDK for the CyberSource REST API (BETA Phase)
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-**Please note that the code in this repository is currently under BETA testing and is not ready to be used in Production servers yet.**
+# .NET Standard Client SDK for the CyberSource REST API
 
 The CyberSource .NET Standard client provides convenient access to the [CyberSource REST API](https://developer.cybersource.com/api/reference/api-reference.html) from your .NET application.