Merge branch '2.x-line' into dev

Author: sloria

CHANGELOG.rst

@@ -618,30 +618,30 @@ Deprecation/Removals:
 - Remove ``extra`` parameter from ``Schema``. Use a ``@post_dump`` method to add additional data.
 
 2.20.3 (2019-09-04)
-*******************
++++++++++++++++++++
 
 Bug fixes:
 
 - Don't swallow ``TypeError`` exceptions raised by ``Field._bind_to_schema`` or ``Schema.on_bind_field`` (:pr:`1376`).
 
 2.20.2 (2019-08-20)
-*******************
++++++++++++++++++++
 
 Bug fixes:
 
 - Prevent warning about importing from ``collections`` on Python 3.7
   (:pr:`1354`). Thanks :user:`nicktimko` for the PR.
 
 2.20.1 (2019-08-13)
-*******************
++++++++++++++++++++
 
 Bug fixes:
 
 - Fix bug that raised ``TypeError`` when invalid data type is
   passed to a nested schema with ``@validates`` (:issue:`1342`).
 
 2.20.0 (2019-08-10)
-*******************
++++++++++++++++++++
 
 Bug fixes: