Update flask-migrate to 2.5.0

[pyup-bot]

This PR updates Flask-Migrate from 2.0.3 to 2.5.0.

Changelog

### 2.5.0 ``` - Support % character n database URLs (59) - Minor improvements to documentation and unit tests ``` ### 2.4.0 ``` - Refreshed the env.py files from the Alembic project (216) ``` ### 2.3.1 ``` - Don't silence transaction errors from SQLAlchemy (236) ``` ### 2.3.0 ``` - Use root logger for alembic error messages - Add `--indicate-current` option to history command (192) ``` ### 2.2.1 ``` - Drop support for Alembic versions before 0.7 - Added pypy3 to test matrix ``` ### 2.2.0 ``` - Suppress stack traces on command errors (204) ``` ### 2.1.1 ``` - Make the `directory` argument to `get_config()` optional (168) ``` ### 2.1.0 ``` - Removed dependency on Flask-Script from setup.py (165) ``` ### 2.0.4 ``` - Support -x arguments in "migrate" command (148) ```

Links

- PyPI: https://pypi.org/project/flask-migrate - Changelog: https://pyup.io/changelogs/flask-migrate/ - Repo: http://github.com/miguelgrinberg/flask-migrate/ - Docs: https://pythonhosted.org/Flask-Migrate/

[scrutinizer-notifier]

The inspection completed: ****

[pyup-bot]

Closing this in favor of #264