README.md in index_shotgun-0.2.0 vs README.md in index_shotgun-0.2.1

@@ -83,11 +83,11 @@
 
 If you want to use as commandline tool, you need to install these gems.
 
 ```sh
 # MySQL
-$ gem install mysql2 -v 0.3.20
+$ gem install mysql2
 
 # Oracle
 $ gem install activerecord-oracle_enhanced-adapter ruby-oci8
 
 # PostgreSQL
@@ -95,10 +95,10 @@
 
 # sqlite3
 $ gem install sqlite3
 ```
 
-**Details:** `index_shotgun` does not yet support `mysql2` v0.4+
+**Details:** requirements `activerecord` gem v4.2.5+ when using `mysql2` gem v0.4.0+
 
 ## Usage
 ### Ruby app
 
 ```sh