README.md in wxianfeng_simple_captcha-0.3.0 vs README.md in wxianfeng_simple_captcha-0.4.0

@@ -17,9 +17,13 @@
     gem 'wxianfeng_simple_captcha', '0.1.0', require: 'simple_captcha' 
 
   Rails >=3.1 
 
     gem 'wxianfeng_simple_captcha', '0.2.0', require: 'simple_captcha' 
+  
+  Rails >=4.0
+  
+    gem 'wxianfeng_simple_captcha', '0.4.0', require: 'simple_captcha'
 
 ## Setup
 
     rails generate simple_captcha 
     rake db:migrate