Updated CHANGES to note the autoservice changes for pbx_lua

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@317833 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -124,6 +124,9 @@ pbx_lua
    priority we are executing on has changed it will immediatly return control
    to the asterisk PBX engine.  Currently the engine cannot detect a Goto to
    the priority after the currently executing priority.
+ * An autoservice is now started by default for pbx_lua channels.  It can be
+   stopped and restarted using the autoservice_stop() and autoservice_start()
+   functions.
 
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 --- Functionality changes from Asterisk 1.6.2 to Asterisk 1.8 ----------------