Added
-----

- Nothing.

Changed
-------

- [#629](https://github.com/zendframework/zend-expressive/pull/629) changes the constructor of `Zend\Expressive\Middleware\ErrorResponseGenerator`
  to accept an additional, optional argument, `$layout`, which defaults to a new
  constant value, `ErrorResponseGenerator::LAYOUT_DEFAULT`, or `layout::default`.
  `Zend\Expressive\Container\ErrorResponseGeneratorFactory` now also looks for
  the configuration value `zend-expressive.error_handler.layout`, and will use
  that value to seed the constructor argument. This change makes the
  `ErrorResponseGenerator` mirror the `NotFoundHandler`, allowing for a
  consistent layout between the two error pages.

Deprecated
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- Nothing.

Removed
-------

- Nothing.

Fixed
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- Nothing.