This update for python-python-sql fixes the following issues:

- update to 1.5.1:
* Use parameter for start and end of WINDOW FRAME
* Use parameter for limit and offset

- version 1.5.0:
* naming scheme broken upstream
* Add MERGE query
* Support “UPSERT” with ON CONFLICT clause on INSERT query
* Remove default escape char on LIKE and ILIKE
* Add GROUPING SETS, CUBE, and ROLLUP clauses for GROUP BY.