libpqtypes - libpqtypes: removed reference to old Object Hooks libpq

Log Message:
-----------
removed reference to old Object Hooks libpq patch from README

Modified Files:
--------------
libpqtypes:
README (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/README.diff?r1=1.5&r2=1.6)
configure.ac (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/libpqtypes/libpqtypes/configure.ac.diff?r1=1.4&r2=1.5)