update readme

Author: fsbraun

README.rst

@@ -175,14 +175,14 @@ Actions are not available for Django forms. Any actions to be performed upon sub
 .. |coverage| image:: https://codecov.io/gh/django-cms/djangocms-form-builder/branch/main/graph/badge.svg
    :target: https://codecov.io/gh/django-cms/djangocms-form-builder
 
-.. |python| image:: https://img.shields.io/badge/python-3.7+-blue.svg
-   :target: https://pypi.org/project/djangocms-form-builder/
+.. |python| image:: https://img.shields.io/pypi/pyversions/djangocms-form-builder
+    :alt: PyPI - Python Version
+    :target: https://pypi.org/project/djangocms-form-builder/
 
-.. |django| image:: https://img.shields.io/badge/django-3.2-blue.svg
-   :target: https://www.djangoproject.com/
+.. |django| image:: https://img.shields.io/pypi/frameworkversions/django/djangocms-form-builder
+    :alt: PyPI - Django Versions from Framework Classifiers
+    :target: https://www.djangoproject.com/
 
-.. |djangocms| image:: https://img.shields.io/badge/django%20CMS-3.8%2B-blue.svg
-   :target: https://www.django-cms.org/
-
-.. |djangocms4| image:: https://img.shields.io/badge/django%20CMS-4-blue.svg
-   :target: https://www.django-cms.org/
+.. |djangocms| image:: https://img.shields.io/pypi/frameworkversions/django-cms/djangocms-form-builder
+    :alt: PyPI - django CMS Versions from Framework Classifiers
+    :target: https://www.django-cms.org/