CHANGES: Add item for new 'pjsip show identif(y|ies) commands

Tested-by: George Joseph
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Merged revisions 428836 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@428837 f38db490-d61c-443f-a65b-d21fe96a405b