Fix README.rst: python 3.7 is not supported

Author: penguinolog

README.rst

@@ -43,11 +43,11 @@ Pros:
 
 ::
 
-    Python 3.7
     Python 3.8
     Python 3.9
     Python 3.10
     Python 3.11
+    Python 3.12
 
 .. note:: Old pythons: For Python 2.7 and PyPy use versions 1.x.x, python 3.4 use versions 2.x.x, python 3.5 and PyPy 3.5 use versions 3.x.x