issue #401: add to Changelog.

docs/changelog.rst

@@ -176,6 +176,7 @@ Fixes
 * `#251 <https://github.com/dw/mitogen/issues/251>`_,
   `#359 <https://github.com/dw/mitogen/issues/359>`_,
   `#396 <https://github.com/dw/mitogen/issues/396>`_,
+  `#401 <https://github.com/dw/mitogen/issues/401>`_,
   `#404 <https://github.com/dw/mitogen/issues/404>`_,
   `#412 <https://github.com/dw/mitogen/issues/412>`_,
   `#436 <https://github.com/dw/mitogen/issues/436>`_,
@@ -432,6 +433,7 @@ bug reports, testing, features and fixes in this release contributed by
 `Mohammed Naser <https://github.com/mnaser/>`_,
 `Peter V. Saveliev <https://github.com/svinota/>`_,
 `Pieter Avonts <https://github.com/pieteravonts/>`_,
+`Ross Williams <https://github.com/overhacked/>`_,
 `Sergey <https://github.com/LuckySB/>`_,
 `Stéphane <https://github.com/sboisson/>`_,
 `Strahinja Kustudic <https://github.com/kustodian>`_,