update README.rst

Signed-off-by: flashdagger <flashdagger@googlemail.com>

Author: flashdagger

README.rst

@@ -5,7 +5,7 @@
 zammadoo
 ========
 
-.. image:: https://img.shields.io/badge/python-3.8%2B-blue?logo=python&logoColor=white
+.. image:: https://img.shields.io/badge/python-3.9%2B-blue?logo=python&logoColor=white
    :target: https://python.org/
    :alt: [Python versions]