updated readme

Author: mmelograno

README.md

@@ -7,7 +7,7 @@ This SDK is designed to work with Split, the platform for controlled rollouts, w
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 ## Compatibility
-This SDK is compatible with **Python 3 and higher**.
+This SDK is compatible with **Python 3.7 and higher**.
 
 ## Getting started
 Below is a simple example that describes the instantiation and most basic usage of our SDK: