chan_pjsip: Update CHANGES file to include 'moh_passthrough' setting

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@427113 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -25,6 +25,8 @@ chan_pjsip
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  * New 'user_eq_phone' endpoint setting. This adds a 'user=phone' parameter
    to the request URI and From URI if the user is determined to be a phone number.
+ * New 'moh_passthrough' endpoint setting. This will pass hold and unhold requests
+   through using SIP re-invites with sendonly and sendrecv accordingly.
 
 Functions
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