Update README.

Author: Maikuolan

README.md

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+[![PHP >= 7.0.0](https://img.shields.io/badge/PHP-%3E%3D%207.0.0-8892bf.svg)](https://maikuolan.github.io/Compatibility-Charts/)
+[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://opensource.org/licenses/MIT)
+
 ## SigTool.
 Generates signatures for [phpMussel](https://github.com/phpMussel/phpMussel) using main.cvd and daily.cvd from [ClamAV](http://www.clamav.net/).