<NME> requirements.txt
<BEF> docutils<0.18

<MSG> Merge pull request #2397 from modoboa/dependabot/pip/docutils-lt-0.19

Update docutils requirement from <0.18 to <0.19
<DFF> @@ -1,1 +1,1 @@
-docutils<0.18
+docutils<0.19

Merge pull request #2397 from modoboa/dependabot/pip/docutils-lt-0.19