Update doc.

Author: niwinz

doc/content.adoc

@@ -1,7 +1,7 @@
 django-redis documentation
 ==========================
 Andrey Antukh, <niwi@niwi.be>
-4.4.4
+4.6.0
 :toc: left
 :numbered:
 :source-highlighter: pygments
@@ -38,7 +38,7 @@ Because:
 Supported django-redis versions
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-- Supported stable version: *4.4.4*
+- Supported stable version: *4.6.0*
 - Supported stable version: *3.8.4*