README.md in fluent-plugin-twitter-0.6.0 vs README.md in fluent-plugin-twitter-0.6.1

- old
+ new
@@ -14,25 +14,28 @@
 
 # for Ubuntu/Debian (eventmachine requires build dependency)
 $ sudo apt-get install build-essential libssl-dev
 ```
 
+## Requirements
+
+| fluent-plugin-twitter | fluentd    | ruby   |
+|--------------------|------------|--------|
+|  0.6.1            | v0.14.x | >= 2.1 |
+|  0.5.4            | v0.12.x | >= 1.9 |
+
 ## Installation
 
-install with `gem` or `fluent-gem` command as:
+install with `gem` or `td-agent-gem` command as:
 
 ```
 # for fluentd
 $ gem install eventmachine
 $ gem install fluent-plugin-twitter
 
-# for td-agent
-$ sudo /usr/lib64/fluent/ruby/bin/fluent-gem install eventmachine
-$ sudo /usr/lib64/fluent/ruby/bin/fluent-gem install fluent-plugin-twitter -v 0.6.0
-
 # for td-agent2
 $ sudo td-agent-gem install eventmachine
-$ sudo td-agent-gem install fluent-plugin-twitter -v 0.6.0
+$ sudo td-agent-gem install fluent-plugin-twitter -v 0.5.4
 ```
 
 ## Input Configuration
 
 ### Input Sample