fix column order

From mysql docs https://dev.mysql.com/doc/refman/5.6/en/columns-table.html,

> ORDINAL_POSITION is necessary because you might want to say ORDER BY ORDINAL_POSITION.
> Unlike SHOW, SELECT does not have automatic ordering.

pymysqlreplication/binlogstream.py

@@ -538,6 +538,7 @@ def __get_table_information(self, schema, table):
                         information_schema.columns
                     WHERE
                         table_schema = %s AND table_name = %s
+                    ORDER BY ORDINAL_POSITION
                     """, (schema, table))
 
                 return cur.fetchall()