Pin flask-sqlalchemy to latest version 2.2

[pyup-bot]

Flask-SQLAlchemy is not pinned to a specific version.

I'm pinning it to the latest version 2.2 for now.

These links might come in handy: PyPI | Changelog | Repo | Docs

Changelog

2.2

---

Released on February 27, 2017, codename Dubnium

• Minimum SQLAlchemy version is 0.8 due to use of sqlalchemy.inspect.
• Added support for custom query_class and model_class as args
  to the SQLAlchemy constructor. (328_)
• Allow listening to SQLAlchemy events on db.session. (364_)
• Allow __bind_key__ on abstract models. (373_)
• Allow SQLALCHEMY_ECHO to be a string. (409_)
• Warn when SQLALCHEMY_DATABASE_URI is not set. (443_)
• Don't let pagination generate invalid page numbers. (460_)
• Drop support of Flask < 0.10. This means the db session is always tied to
  the app context and its teardown event. (461_)
• Tablename generation logic no longer accesses class properties unless they
  are declared_attr. (467_)

.. _328: pallets-eco/flask-sqlalchemy#328
.. _364: pallets-eco/flask-sqlalchemy#364
.. _373: pallets-eco/flask-sqlalchemy#373
.. _409: pallets-eco/flask-sqlalchemy#409
.. _443: pallets-eco/flask-sqlalchemy#443
.. _460: pallets-eco/flask-sqlalchemy#460
.. _461: pallets-eco/flask-sqlalchemy#461
.. _467: pallets-eco/flask-sqlalchemy#467

2.1

---

Released on October 23rd 2015, codename Caesium

• Table names are automatically generated in more cases, including
  subclassing mixins and abstract models.
• Allow using a custom MetaData object.
• Add support for binds parameter to session.

2.0

---

Released on August 29th 2014, codename Bohrium

• Changed how the builtin signals are subscribed to skip non Flask-SQLAlchemy
  sessions. This will also fix the attribute error about model changes
  not existing.
• Added a way to control how signals for model modifications are tracked.
• Made the SignallingSession a public interface and added a hook
  for customizing session creation.
• If the bind parameter is given to the signalling session it will no
  longer cause an error that a parameter is given twice.
• Added working table reflection support.
• Enabled autoflush by default.
• Consider SQLALCHEMY_COMMIT_ON_TEARDOWN harmful and remove from docs.

1.0

---

Released on July 20th 2013, codename Aurum

• Added Python 3.3 support.
• Dropped 2.5 compatibility.
• Various bugfixes
• Changed versioning format to do major releases for each update now.

0.16

---

• New distribution format (flask_sqlalchemy)
• Added support for Flask 0.9 specifics.

0.15

---

• Added session support for multiple databases

0.14

---

• Make relative sqlite paths relative to the application root.

0.13

---

• Fixed an issue with Flask-SQLAlchemy not selecting the correct binds.

0.12

---

• Added support for multiple databases.
• Expose Flask-SQLAlchemy's BaseQuery as db.Query.
• Set default query_class for db.relation, db.relationship, and
  db.dynamic_loader to Flask-SQLAlchemy's BaseQuery.
• Improved compatibility with Flask 0.7.

0.11

---

• Fixed a bug introduced in 0.10 with alternative table constructors.

0.10

---

• Added support for signals.
• Table names are now automatically set from the class name unless
  overriden.
• Model.query now always works for applications directly passed to
  the SQLAlchemy constructor. Furthermore the property now raises
  an RuntimeError instead of being None.
• added session options to constructor.
• fixed a broken __repr__
• db.Table is now a factor function that creates table objects.
  This makes it possible to omit the metadata.

0.9

---

• applied changes to pass the Flask extension approval process.

0.8

---

• added a few configuration keys for creating connections.
• automatically activate connection recycling for MySQL connections.
• added support for the Flask testing mode.

0.7

---

• Initial public release

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖