infra: pin version for ducutils (#2277)

icywang86rui · Rui Wang Napieralski · web-flow · commit 63fa261f227d · 2021-04-08T10:40:03.000-07:00
Co-authored-by: Rui Wang Napieralski &lt;wru@amazon.com&gt;
diff --git a/doc/requirements.txt b/doc/requirements.txt
@@ -1,2 +1,3 @@
 sphinx==3.1.1
 sphinx-rtd-theme==0.5.0
+docutils==0.15.2
