Add PSR-7 to the requirements in the readme

This fixes issue #640
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Andrew Millington 2018-05-16 13:36:29 +01:00 committed by GitHub
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@ -37,6 +37,8 @@ The following versions of PHP are supported:
The `openssl` extension is also required.
All HTTP messages passed to the server should be [PSR-7 compliant](https://www.php-fig.org/psr/psr-7/). This ensures interoperability between other packages and frameworks.
## Installation
```