releases: update to include 3.4 honister

Adding 3.4 to the release switcher and incrementing dev to say 3.5.

(From yocto-docs rev: a171e88bc572e45d700d257a9de521520b4d5d5e)

Signed-off-by: Michael Halstead <mhalstead@linuxfoundation.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/sphinx-static/switchers.js

@@ -2,7 +2,8 @@
   'use strict';
 
   var all_versions = {
-    'dev': 'dev (3.4)',
+    'dev': 'dev (3.5)',
+    '3.4': '3.4',
     '3.3.3': '3.3.3',
     '3.2.4': '3.2.4',
     '3.1.11': '3.1.11',