Update README

Author: Ivan Kamkin

README.md

@@ -26,7 +26,7 @@ This repository contains Aspose.BarCode Cloud SDK for Python source code. This S
 
 Supported Python versions:
 
-- Python 3.6+
+- Python 3.7+
 
 To use these SDKs, you will need Client Id and Client Secret which can be looked up at [Aspose Cloud Dashboard](https://dashboard.aspose.cloud/applications) (free registration in Aspose Cloud is required for this).