Renaming CI step

Author: carlio

.github/workflows/testing.yml renamed to .github/workflows/build.yml

@@ -1,8 +1,8 @@
 pylint-django
 =============
 
-.. image:: https://github.com/PyCQA/pylint-django/actions/workflows/testing.yml/badge.svg
-    :target: https://github.com/PyCQA/pylint-django/actions/workflows/testing.yml
+.. image:: https://github.com/PyCQA/pylint-django/actions/workflows/build.yml/badge.svg
+    :target: https://github.com/PyCQA/pylint-django/actions/workflows/build.yml
 
 .. image:: https://coveralls.io/repos/github/PyCQA/pylint-django/badge.svg?branch=master
      :target: https://coveralls.io/github/PyCQA/pylint-django?branch=master