<NME> requirements.txt
<BEF> docutils<0.19

<MSG> Merge pull request #2558 from modoboa/dependabot/pip/docutils-lt-0.20

Update docutils requirement from <0.19 to <0.20
<DFF> @@ -1,1 +1,1 @@
-docutils<0.19
+docutils<0.20

Merge pull request #2558 from modoboa/dependabot/pip/docutils-lt-0.20