[docs] Fixed build status badge

[skip ci]

README.rst

@@ -757,8 +757,8 @@ Contributing
 8. Document your changes
 9. Send pull request
 
-.. |Build Status| image:: https://github.com/openwisp/django-rest-framework-gis/workflows/Django%20Rest%20Framework%20Gis%20CI%20Build/badge.svg?branch=master
-   :target: https://github.com/openwisp/django-rest-framework-gis/actions?query=workflow%3A%22Django+Rest+Framework+Gis+CI+Build%22
+.. |Build Status| image:: https://github.com/openwisp/django-rest-framework-gis/actions/workflows/ci.yml/badge.svg
+   :target: https://github.com/openwisp/django-rest-framework-gis/actions/workflows/ci.yml
 .. |Coverage Status| image:: https://coveralls.io/repos/openwisp/django-rest-framework-gis/badge.svg
    :target: https://coveralls.io/r/openwisp/django-rest-framework-gis
 .. |Requirements Status| image:: https://img.shields.io/librariesio/release/github/openwisp/django-rest-framework-gis