Update README to reflect python requirement is 3.9-3.12 (#338)

Co-authored-by: Alex <akagan@openwater.cc>

Author: alkagan

README.rst

@@ -20,7 +20,7 @@ Installation
 Requirements
 ~~~~~~~~~~~~
 
-Python 3.9 or later on Windows or Linux.
+Python 3.9-3.12 on Windows or Linux.
 
 Create Virtual Environment
 ~~~~~~~~~~~~~~~~~~~~~~~~~~