Based on https://github.com/zendframework/zend-diactoros/releases/tag/2.1.0 (commit f9be2ed37ddf5a47c9761a6e5dceddc3fbc4ab77 in this repo)

Added
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- [zendframework/zend-diactoros#345](https://github.com/zendframework/zend-diactoros/pull/345) adds support for PHP 7.3.

Changed
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- Nothing.

Deprecated
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- Nothing.

Removed
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- Nothing.

Fixed
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- Nothing.