Merge pull request #119 from edx/robrap/fix-changelog-formatting

fix: changelog formatting issues

Author: robrap

CHANGELOG.rst

@@ -14,20 +14,21 @@ Change Log
 Unreleased
 ----------
 
-[4.0.0] = 2021-04-30
+[4.0.0] - 2021-05-03
+--------------------
 
 Removed
--------
+_______
 
 * Removed the old location of ``CodeOwnerMonitoringMiddleware``. It had moved in a past commit. Although technically a breaking change, all references in the Open edX platform have already been updated to point to the new location.
 
 Added
------
+_____
 
 * Added new ``code_owner_theme`` and ``code_owner_squad`` custom attributes. This is useful in cases where the ``code_owner`` combines a theme and squad name, because monitoring can instead reference ``code_owner_squad`` to be resilient to theme name updates. For the decision doc, see edx_django_utils/monitoring/docs/decisions/0004-code-owner-theme-and-squad.rst.
 
 Updated
--------
+_______
 
 * Misconfigurations of CODE_OWNER_MAPPINGS will now fail fast, rather than just logging. Although technically a breaking change, if CODE_OWNER_MAPPINGS is in use, it is probably correctly configured and this change should be a no-op.