3.0 is now stable version

docs/.templates/page.html

@@ -2,7 +2,7 @@
 {% block body %}
 <div class="deck">
 
-    {% if version == "2.6" or version == "3.0" %}
+    {% if version == "3.1" or version == "4.0" %}
         <p class="developmentversion">
         This document is for Celery's development version, which can be
         significantly different from previous releases. Get old docs here: