npgsql - Npgsql2: Updated RELEASENOTES to include a last minute fix.

Log Message:
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Updated RELEASENOTES to include a last minute fix.

Fixed a possible lockup when using SyncNotification. Runtime wasn't releasing the lock fairly. See
http://pgfoundry.org/forum/message.php?msg_id=1002650for more info. Thanks Clive Simmens (cs at ctronix dot com) for
headsup, tests and patch. 

Modified Files:
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    Npgsql2:
        RELEASENOTES.txt (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/RELEASENOTES.txt.diff?r1=1.2&r2=1.3)
    Npgsql2/src/Npgsql:
        NpgsqlConnector.cs (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlConnector.cs.diff?r1=1.6&r2=1.7)