Based on https://github.com/zendframework/zend-diactoros/releases/tag/1.8.1 (commit 78316d61920798149378df6ee1ab8b57835a7c9e in this repo)

Added
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- Nothing.

Changed
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- [zendframework/zend-diactoros#313](https://github.com/zendframework/zend-diactoros/pull/313) changes the reason phrase associated with the status code 425
  to "Too Early", corresponding to a new definition of the code as specified by the IANA.

Deprecated
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- Nothing.

Removed
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- Nothing.

Fixed
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- [zendframework/zend-diactoros#312](https://github.com/zendframework/zend-diactoros/pull/312) fixes how the `normalizeUploadedFiles()` utility function handles nested trees of
  uploaded files, ensuring it detects them properly.