Bump sqlalchemy from 1.3.16 to 1.3.20

Bumps sqlalchemy from 1.3.16 to 1.3.20.

Release notes

Sourced from sqlalchemy's releases.

1.3.20

Released: October 12, 2020

orm

• [orm] [bug] An ArgumentError with more detail is now raised if the target parameter for _query.Query.join() is set to an unmapped object. Prior to this change a less detailed AttributeError was raised. Pull request courtesy Ramon Williams.

  References: #4428

• [orm] [bug] Fixed issue where using a loader option against a string attribute name that is not actually a mapped attribute, such as a plain Python descriptor, would raise an uninformative AttributeError; a descriptive error is now raised.

  References: #4589

engine

• [engine] [bug] Fixed issue where a non-string object sent to _exc.SQLAlchemyError or a subclass, as occurs with some third party dialects, would fail to stringify correctly. Pull request courtesy Andrzej Bartosiński.

  References: #5599

• [engine] [bug] Repaired a function-level import that was not using SQLAlchemy's standard late-import system within the sqlalchemy.exc module.

  References: #5632

sql

• [sql] [bug] Fixed issue where the pickle.dumps() operation against _expression.Over construct would produce a recursion overflow.

  References: #5644

• [sql] [bug] Fixed bug where an error was not raised in the case where a _sql.column() were added to more than one _sql.table() at a time. This raised correctly for the _schema.Column and _schema.Table objects. An _exc.ArgumentError is now raised when this occurs.

... (truncated)

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