[docs] Prepare v0.21.0.

seifertm · seifertm · commit 75dcceafcea9 · 2023-03-19T11:07:34.000+01:00
Signed-off-by: Michael Seifert &lt;m.seifert@digitalernachschub.de&gt;
diff --git a/docs/source/reference/changelog.rst b/docs/source/reference/changelog.rst
@@ -2,7 +2,7 @@
 Changelog
 =========
 
-UNRELEASED
+0.21.0 (23-03-19)
 =================
 - Drop compatibility with pytest 6.1. Pytest-asyncio now depends on pytest 7.0 or newer.
 - pytest-asyncio cleans up any stale event loops when setting up and tearing down the
