Update minimum PHP version

Update minimum PHP version and add PSR-7 compliance message
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Andrew Millington 2018-05-25 10:39:39 +01:00 committed by GitHub
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@ -12,9 +12,10 @@ This library uses key cryptography in order to encrypt and decrypt, as well as v
The following versions of PHP are supported:
* PHP 5.6
* PHP 7.0
* PHP 7.1
* PHP 7.2
The `openssl` PHP extension is 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.