Updated README.md

ozdemirburak · Oct 12, 2019 · e80d2e6 · e80d2e6
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 [![Build Status][ico-travis]][link-travis]
 [![Total Downloads][ico-downloads]][link-downloads]
 
-PHP library for color manipulation and conversion.
+PHP library for color manipulation and conversion. 
 
 ## Install
 
@@ -15,6 +15,8 @@ Via Composer
 $ composer require ozdemirburak/iris
 ```
 
+For PHP 7.0 and below, use `~1.0` instead.
+
 ## Usage
 
 ### Hex