[COMMITTERS] pgsql: Update release checlist.

[Bruce Momjian]

Log Message:
-----------
Update release checlist.

Modified Files:
--------------
    pgsql/src/tools:
        RELEASE_CHANGES (r1.63 -> r1.64)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/RELEASE_CHANGES.diff?r1=1.63&r2=1.64)

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TIP 5: don't forget to increase your free space map settings