update ConnectionPool example to use Transactor
update ConnectionPool example to use Transactor

coltfred/doobie,wedens/doobie,jamescway/doobie,jamescway/doobie,rperry/doobie,beni55/doobie,coltfred/doobie,tpolecat/doobie,rperry/doobie,wedens/doobie,beni55/doobie,refried/doobie,refried/doobie