README.md in index_shotgun-0.2.1 vs README.md in index_shotgun-0.3.0

@@ -3,10 +3,12 @@
 [![Build Status](https://travis-ci.org/sue445/index_shotgun.svg?branch=master)](https://travis-ci.org/sue445/index_shotgun)
 [![Code Climate](https://codeclimate.com/github/sue445/index_shotgun/badges/gpa.svg)](https://codeclimate.com/github/sue445/index_shotgun)
 [![Coverage Status](https://coveralls.io/repos/sue445/index_shotgun/badge.svg?branch=master&service=github)](https://coveralls.io/github/sue445/index_shotgun?branch=master)
 [![Dependency Status](https://gemnasium.com/sue445/index_shotgun.svg)](https://gemnasium.com/sue445/index_shotgun)
 
+[![wercker status](https://app.wercker.com/status/1af95c0c5debe57562ec3036c849f80d/m/master "wercker status")](https://app.wercker.com/project/bykey/1af95c0c5debe57562ec3036c849f80d)
+
 Duplicate index checker.
 
 This like [pt-duplicate-key-checker](https://www.percona.com/doc/percona-toolkit/2.1/pt-duplicate-key-checker.html), but also supports database other than MySQL
 
 ## Example
@@ -95,10 +97,10 @@
 
 # sqlite3
 $ gem install sqlite3
 ```
 
-**Details:** requirements `activerecord` gem v4.2.5+ when using `mysql2` gem v0.4.0+
+**Note:** requirements `activerecord` gem v4.2.5+ when using `mysql2` gem v0.4.0+
 
 ## Usage
 ### Ruby app
 
 ```sh