metadata for release 0.19.1 (#402)

* update change log

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* change version to 0.19.1

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

CHANGES.rst

@@ -1,6 +1,11 @@
 0.20.0 (unreleased)
 -------------------
 
+-
+
+0.19.1 (2024-04-04)
+-------------------
+
 - Add new schemas to documentation. [#386]
 
 - Convert tag keywords to wildcards for external tags. [#370]