[Pgpool-committers] pgpool - pgpool: Fix release date

[User T-ishii]

Log Message:
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Fix release date

Modified Files:
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    pgpool:
        ChangeLog (r1.20 -> r1.21)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgpool/pgpool/ChangeLog.diff?r1=1.20&r2=1.21)