What's Changed
* Ignorable tables by mhauru in https://github.com/alan-turing-institute/sqlsynthgen/pull/141
* Logging verbosity by mhauru in https://github.com/alan-turing-institute/sqlsynthgen/pull/145
* Add instructions for SQL Server by Iain-S in https://github.com/alan-turing-institute/sqlsynthgen/pull/149
* Documentation improvements by mhauru in https://github.com/alan-turing-institute/sqlsynthgen/pull/155
* Improve AirBnB tutorial by mhauru in https://github.com/alan-turing-institute/sqlsynthgen/pull/159
* Add SQLGroupByProvider and NullProvider by mhauru in https://github.com/alan-turing-institute/sqlsynthgen/pull/158
* Fix typos in docs by mhauru in https://github.com/alan-turing-institute/sqlsynthgen/pull/160
* Default to null_provider for unrecognised column types, with warning by mhauru in https://github.com/alan-turing-institute/sqlsynthgen/pull/161
* Bump version to 0.4.0 by mhauru in https://github.com/alan-turing-institute/sqlsynthgen/pull/164
**Full Changelog**: https://github.com/alan-turing-institute/sqlsynthgen/compare/0.3.3...0.4.0