Add requirements to README

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Niklas Keller
2016-03-25 15:48:34 +01:00
parent 7cfcb575fa
commit c94d9b4795

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`kelunik/acme-client` is an ACME client written in PHP. ACME is the protocol that powers the [Let's Encrypt](https://letsencrypt.org) certificate authority.
## Requirements
* PHP 5.5+ with OpenSSL
* Works on Unix and Windows
## Documentation
* [Installation](./doc/installation.md)