Make the subheading ^s match the text length

WillGibson · web-flow · commit ec8923078f92 · 2025-05-24T07:14:57.000+01:00
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
@@ -29,7 +29,7 @@ Running your local version of Mutmut against a test codebase
 You can install your local version of Mutmut and run it, including any changes you have made, as normal.
 
 Codebases using pip
-^^^^^^^^^
+^^^^^^^^^^^^^^^^^^^
 
 .. code-block:: console
 
