Based on https://github.com/zendframework/zend-diactoros/releases/tag/1.0.3 (commit bf0bee455dd8cfe797ebf5b82262cecc7366513f in this repo)

Added
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- [zendframework/zend-diactoros#48](https://github.com/zendframework/zend-diactoros/pull/48) drops the
  minimum supported PHP version to 5.4, to allow an easier upgrade path for
  Symfony 2.7 users, and potential Drupal 8 usage.

Deprecated
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- Nothing.

Removed
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- Nothing.

Fixed
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- Nothing.