Update docs-requirements.txt

TParcollet · web-flow · commit 3f12fac5bf8d · 2021-03-14T17:19:22.000+01:00
diff --git a/docs/docs-requirements.txt b/docs/docs-requirements.txt
@@ -2,3 +2,4 @@ better-apidoc>=0.3.1
 recommonmark>=0.7.1
 sphinx-rtd-theme>=0.4.3
 Sphinx>=3.4.3
+six
