Update README.md

Fix: Python version in README

Author: f-allian

README.md

@@ -25,7 +25,7 @@ system-under-test that is expected to cause a change to some output(s).
 ## Installation
 
 ### Requirements
-- Python 3.9, 3.10, 3.11 and 3.12
+- Python 3.10, 3.11 and 3.12
 
 - Microsoft Visual C++ 14.0+ (Windows only).
 
@@ -121,4 +121,4 @@ To find the other (optional) developer dependencies, please check `pyproject.tom
 
 The Causal Testing Framework is supported by the UK's Engineering and Physical Sciences Research Council (EPSRC),
 with the project name [CITCOM](https://gow.epsrc.ukri.org/NGBOViewGrant.aspx?GrantRef=EP/T030526/1) - "_Causal Inference for Testing of Computational Models_" 
-under the grant EP/T030526/1.
+under the grant EP/T030526/1.