Update compatibility notice.

Add Rails 4 and Ruby 2.

README.md

@@ -7,9 +7,9 @@ Geocoder is a complete geocoding solution for Ruby. With Rails it adds geocoding
 Compatibility
 -------------
 
-* Supports multiple Ruby versions: Ruby 1.8.7, 1.9.2, 1.9.3, and JRuby.
+* Supports multiple Ruby versions: Ruby 1.8.7, 1.9.2, 1.9.3, 2.0.0, and JRuby.
 * Supports multiple databases: MySQL, PostgreSQL, SQLite, and MongoDB (1.7.0 and higher).
-* Supports Rails 3.x. If you need to use it with Rails 2 please see the `rails2` branch (no longer maintained, limited feature set).
+* Supports Rails 3 and 4. If you need to use it with Rails 2 please see the `rails2` branch (no longer maintained, limited feature set).
 * Works very well outside of Rails, you just need to install either the `json` (for MRI) or `json_pure` (for JRuby) gem.