Update method name

Author: Loay Gewily

lib/discovery.js

@@ -164,7 +164,7 @@ function mixinDiscovery(PostgreSQL) {
    * @param table
    * @returns {string}
    */
-  PostgreSQL.prototype.queryForPrimaryKeys = function(owner, table) {
+  PostgreSQL.prototype.queryPrimaryKeys = function(owner, table) {
     var sql = 'SELECT kc.table_schema AS "owner", '
       + 'kc.table_name AS "tableName", kc.column_name AS "columnName",'
       + ' kc.ordinal_position AS "keySeq",'