Fix RTD builds.

Same approach which helped for zope.sequencesort.
zopefoundation · Nov 11, 2021 · c1a3e7c · c1a3e7c
1 parent b0a5143
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diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -0,0 +1,5 @@
+version: 2
+
+python:
+  install:
+  - requirements: docs/requirements.txt
diff --git a/requirements-rtd.txt → docs/requirements.txt b/requirements-rtd.txt → docs/requirements.txt
@@ -1,3 +1,4 @@
-Zope
+Sphinx==4.2.0
 ZConfig
+Zope
 tempstorage