Merge pull request #845 from pytorch/brianjo-191versions-update

Update versions.html for 1.9.1

Author: malfet

docs/versions.html

@@ -21,7 +21,10 @@ <h1> PyTorch Documentation </h1>
           <a class="reference internal" href="master/">master (unstable)</a>
         </li>
         <li class="toctree-l1">
-          <a class="reference internal" href="1.9.0/">v1.9.0 (stable release)</a>
+          <a class="reference internal" href="1.9.1/">v1.9.1 (stable release)</a>
+        </li>
+        <li class="toctree-l1">
+          <a class="reference internal" href="1.9.0/">v1.9.0</a>
         </li>
         <li class="toctree-l1">
           <a class="reference internal" href="1.8.1/">v1.8.1</a>