Updated docs version selector

docs/sources/versions.html_fragment

@@ -1,2 +1,2 @@
-<li><a class='version' href='/v2.0'>Version v2.0 (beta)</a></li>
-<li><a class='version' href='/v1.9'>Version v1.9 (stable)</a></li>
+<li><a class='version' href='/v2.0'>Version v2.0</a></li>
+<li><a class='version' href='/v1.9'>Version v1.9</a></li>