[COMMITTERS] pgsql: Mention libpq.rc.in is now the file to update for releases.

[Bruce Momjian]

Log Message:
-----------
Mention libpq.rc.in is now the file to update for releases.

Modified Files:
--------------
    pgsql/src/tools:
        RELEASE_CHANGES (r1.51 -> r1.52)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/RELEASE_CHANGES.diff?r1=1.51&r2=1.52)

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