Bump sqlalchemy from 1.1.5 to 1.3.0 in /examples/flask_wtf

[dependabot]

Bumps sqlalchemy from 1.1.5 to 1.3.0.

Release notes

Sourced from sqlalchemy's releases.

1.3.0

Released: March 4, 2019

• [feature] [schema] Added new parameters Table.resolve_fks and MetaData.reflect.resolve_fks which when set to False will disable the automatic reflection of related tables encountered in ForeignKey objects, which can both reduce SQL overhead for omitted tables as well as avoid tables that can't be reflected for database-specific reasons. Two Table objects present in the same MetaData collection can still refer to each other even if the reflection of the two tables occurred separately.

  References: #4517

• [feature] [orm] The Query.get() method can now accept a dictionary of attribute keys and values as a means of indicating the primary key value to load; is particularly useful for composite primary keys. Pull request courtesy Sanjana S.

  References: #4316

• [feature] [orm] A SQL expression can now be assigned to a primary key attribute for an ORM flush in the same manner as ordinary attributes as described in flush_embedded_sql_expressions where the expression will be evaulated and then returned to the ORM using RETURNING, or in the case of pysqlite, works using the cursor.lastrowid attribute.Requires either a database that supports RETURNING (e.g. Postgresql, Oracle, SQL Server) or pysqlite.

  References: #3133

• [bug] [sql] The Alias class and related subclasses CTE, Lateral and TableSample have been reworked so that it is not possible for a user to construct the objects directly. These constructs require that the standalone construction function or selectable-bound method be used to instantiate new objects.

  References: #4509

• [engine] [feature] Revised the formatting for StatementError when stringified. Each error detail is broken up over multiple newlines instead of spaced out on a single line. Additionally, the SQL representation now stringifies the SQL statement rather than using repr(), so that newlines are rendered as is. Pull request courtesy Nate Clark.

  References: #4500

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