Update README.md

Some users report errors with aesara and python 3.11

Author: Japhiolite

README.md

@@ -37,7 +37,7 @@ For more information, refer to the [installation documentation](https://docs.gem
 ## Requirements
 
 The following versions are required/strongly recommended for the main dependencies of GemPy (as of June 2023):
-- python>=3.10
+- python=3.10
 - pandas=2.0.1
 - matplotlib>=3.7
 - pyvista>=0.39