Pugsql

* Multi-row inserts are always passed as a single list argument, e.g. `module.create([ { 'x': 1 }, { 'x': 2 }])`. Previously this was inconsisent when running inside or outside a transaction. See [73](https://github.com/mcfunley/pugsql/issues/73) for discussion. Thanks to [Guillaume Pelletier](https://github.com/epgui)!

* Upgraded sqlalchemy version to >2.0.
* Dropped support for Python before 3.8.1.
* Now accepting interstitial whitespace in the leading comment block.

* Transactions are now automatically committed when leaving a transaction context when using nested transactions, thanks to [Oleksandr Fedorov](https://github.com/o-fedorov/).
* Improved feedback when mistakenly passing positional arguments to statements that don't support it.
* Dropped support for Python 3.5 and 3.6.
* Added test coverage for some postgres-specific tests.
* Migrated test suite from TravisCI to GitHub Actions.
* Fixed broken test suite on Python 3.10

* Fixes Python 3.5 tests which were broken in 0.2.2. Began release testing with 3.8.

* Support for nested transactions [40](https://github.com/mcfunley/pugsql/issues/40) thanks to [Hosein Yeganloo](https://github.com/Yeganloo).
* Modules expose the [SQLAlchemy engine](https://docs.sqlalchemy.org/en/13/core/connections.html#sqlalchemy.engine.Engine) they are using ([5](https://github.com/mcfunley/pugsql/issues/5)).

* Added support for adding queries from another path to a module (see [29](https://github.com/mcfunley/pugsql/issues/29)).