Update Phalcon_Db_Adapter_Pdo_Postgresql.rst

В коде абзаца fetchOne заменить 
$robot = $connection->fecthOne("SELECT * FROM robots");
$robot = $connection->fecthOne("SELECT * FROM robots", Phalcon\Db::FETCH_ASSOC);
на 
$robot = $connection->fetchOne("SELECT * FROM robots");
$robot = $connection->fetchOne("SELECT * FROM robots", Phalcon\Db::FETCH_ASSOC);
Merge pull request #149 from relort/patch-6

Update Phalcon_Db_Adapter_Pdo_Postgresql.rst