[COMMITTERS] pgsql: Update release checklist.

[Bruce Momjian]

Log Message:
-----------
Update release checklist.

Modified Files:
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    pgsql/src/tools:
        RELEASE_CHANGES (r1.60 -> r1.61)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/RELEASE_CHANGES.diff?r1=1.60&r2=1.61)

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