Correct build status badge in README (#980)

Signed-off-by: Gábor Lipták <[email protected]>
Co-authored-by: Eric Brown <[email protected]>

Author: gliptak

README.rst

@@ -3,8 +3,8 @@
 
 ======
 
-.. image:: https://github.com/PyCQA/bandit/workflows/Build%20and%20Test%20Bandit/badge.svg
-    :target: https://github.com/PyCQA/bandit/actions?query=workflow%3A%22Build+and+Test+Bandit%22
+.. image:: https://github.com/PyCQA/bandit/actions/workflows/pythonpackage.yml/badge.svg?branch=main
+    :target: https://github.com/PyCQA/bandit/actions?query=workflow%3A%22Build+and+Test+Bandit%22+branch%3Amain
     :alt: Build Status
 
 .. image:: https://readthedocs.org/projects/bandit/badge/?version=latest