Based on https://github.com/zendframework/zend-diactoros/releases/tag/1.1.1 (commit b6e927c82c141944f4618d131d050d29a690b0d0 in this repo)

Added
-----

- Nothing.

Deprecated
----------

- Nothing.

Removed
-------

- Nothing.

Fixed
-----

- [zendframework/zend-diactoros#64](https://github.com/zendframework/zend-diactoros/pull/64) fixes the
  behavior of `JsonResponse` with regards to serialization of `null` and scalar
  values; the new behavior is to serialize them verbatim, without any casting.