README更新

README.md

@@ -2,16 +2,18 @@ php-chatwork-api
 ================
 
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 [![Scrutinizer Quality Score](https://scrutinizer-ci.com/g/polidog/php-chatwork-api/badges/quality-score.png?s=56ea782f70ecfbe3de485e4be2a2c585455e44e3)](https://scrutinizer-ci.com/g/polidog/php-chatwork-api/)
 [![Latest Stable Version](https://poser.pugx.org/polidog/php-chatwork-api/v/stable.svg)](https://packagist.org/packages/polidog/php-chatwork-api)
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 [![License](https://poser.pugx.org/polidog/php-chatwork-api/license.svg)](https://packagist.org/packages/polidog/php-chatwork-api)
 
 [Chatwork](http://www.chatwork.com/ja/) APIをPHPから利用するためのライブラリです。
 
-## 必要
-- PHP5.5+
+## 動くPHPのバージョン
+- PHP5.5以上
+
+5.5以下の場合はv0.1.1だったら動きます(たぶん)。
 
 
 ## Install