docs requirements: importlib backport for python 3.7

Jasper van den Bosch · Jasper van den Bosch · commit 3dda8b86469f · 2022-11-06T19:05:57.000+01:00
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -2,3 +2,4 @@ sphinx
 nbsphinx
 nbsphinx-link
 ipykernel
+importlib_metadata;python_version<'3.8'
