Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 1.3.8 to 1.3.9.
- [Release notes](https://github.com/sqlalchemy/sqlalchemy/releases)
- [Changelog](https://github.com/sqlalchemy/sqlalchemy/blob/master/CHANGES)
- [Commits](https://github.com/sqlalchemy/sqlalchemy/commits

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [flask-sqlalchemy](https://github.com/pallets/flask-sqlalchemy) from 2.4.0 to 2.4.1.
- [Release notes](https://github.com/pallets/flask-sqlalchemy/releases)
- [Changelog](https://github.com/pallets/flask-sqlalchemy/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/flask-sqlalchemy/compare/2.4.0...2.4.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [environs](https://github.com/sloria/environs) from 5.2.1 to 6.0.0.
- [Release notes](https://github.com/sloria/environs/releases)
- [Changelog](https://github.com/sloria/environs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sloria/environs/compare/5.2.1...6.0.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.15.6 to 0.16.0.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/werkzeug/compare/0.15.6...0.16.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Beginning with the 2.8 release of psycopg, the package is built from source, requiring the user to install system dependencies. Switch to using psycopg-binary package to maintain pre-2.8 behavior of installing from wheel

Bumps [sqlalchemy](https://bitbucket.org/zzzeek/sqlalchemy) from 1.2.10 to 1.2.11.
- [Changelog](https://bitbucket.org/zzzeek/sqlalchemy/src/master/CHANGES)
- [Commits](https://bitbucket.org/zzzeek/sqlalchemy/commits

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

As per https://12factor.net/

Use environs/python-dotenv for reading/parsing variables

Bumps [flask-migrate](https://github.com/miguelgrinberg/flask-migrate) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/miguelgrinberg/flask-migrate/releases)
- [Changelog](https://github.com/miguelgrinberg/Flask-Migrate/blob/master/CHANGELOG.md)
- [Commits](https://github.com/miguelgrinberg/flask-migrate/compare/v2.2.0...v2.2.1

)

Signed-off-by: dependabot[bot] <support@dependabot.com>