update readme. add some badges

Author: inhere

README.md

@@ -1,5 +1,11 @@
 # php utils
 
+[![License](https://img.shields.io/packagist/l/php-toolkit/php-utils.svg?style=flat-square)](LICENSE)
+[![Php Version](https://img.shields.io/badge/php-%3E=7.1.0-brightgreen.svg?maxAge=2592000)](https://packagist.org/packages/php-toolkit/php-utils)
+[![Latest Stable Version](http://img.shields.io/packagist/v/php-toolkit/php-utils.svg)](https://packagist.org/packages/php-toolkit/php-utils)
+
+Some useful basic tool class for php.
+
 Contains:
 
 - simple autoloader
@@ -9,12 +15,12 @@ Contains:
 - common php helper
 - and more ...
 
-## install
+## Install
 
 ```bash
 composer require toolkit/php-utils
 ```
 
-## license
+## License
 
 MIT