Bump sqlalchemy from 1.3.8 to 1.3.9

[dependabot-preview]

Bumps sqlalchemy from 1.3.8 to 1.3.9.

Release notes

Sourced from sqlalchemy's releases.

1.3.9

Released: October 4, 2019

• [engine] [usecase] Added new create_engine() parameter
  create_engine.max_identifier_length. This overrides the
  dialect-coded "max identifier length" in order to accommodate for databases
  that have recently changed this length and the SQLAlchemy dialect has
  not yet been adjusted to detect for that version. This parameter interacts
  with the existing create_engine.label_length parameter in that
  it establishes the maximum (and default) value for anonymously generated
  labels. Additionally, post-connection detection of max identifier lengths
  has been added to the dialect system. This feature is first being used
  by the Oracle dialect.

  References: #4857

• [oracle] [usecase] The Oracle dialect now emits a warning if Oracle version 12.2 or greater is
  used, and the create_engine.max_identifier_length parameter is
  not set. The version in this specific case defaults to that of the
  "compatibility" version set in the Oracle server configuration, not the
  actual server version. In version 1.4, the default max_identifier_length
  for 12.2 or greater will move to 128 characters. In order to maintain
  forwards compatibility, applications should set
  create_engine.max_identifier_length to 30 in order to maintain
  the same length behavior, or to 128 in order to test the upcoming behavior.
  This length determines among other things how generated constraint names
  are truncated for statements like CREATE CONSTRAINT and DROP CONSTRAINT, which means a the new length may produce a name-mismatch
  against a name that was generated with the old length, impacting database
  migrations.

  References: #4857

• [sqlite] [usecase] Added support for sqlite "URI" connections, which allow for sqlite-specific
  flags to be passed in the query string such as "read only" for Python
  sqlite3 drivers that support this.

  References: #4863

• [bug] [tests] Fixed unit test regression released in 1.3.8 that would cause failure for
  Oracle, SQL Server and other non-native ENUM platforms due to new
  enumeration tests added as part of #4285 enum sortability in the
  unit of work; the enumerations created constraints that were duplicated on
  name.

  References: #4285

• [bug] [oracle] Restored adding cx_Oracle.DATETIME to the setinputsizes() call when a
  SQLAlchemy Date, DateTime or Time datatype is

... (truncated)

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[coveralls]

Coverage remained the same at 25.455% when pulling 4bee157 on dependabot/pip/sqlalchemy-1.3.9 into 3dc4564 on master.

[dependabot-preview]

Superseded by #836.