Add language identifier to syntax highlighting block

README.md

@@ -54,13 +54,13 @@ Other configuration options:
 
 Given the following OA 0.3 configuration:
 
-```
+```ruby
 provider :CAS, :cas_server => 'https://cas.example.com/cas/'
 ```
 
 ... your new settings should look similar to this:
 
-```
+```ruby
 provider :cas, :host => 'cas.example.com',
          :login_url => '/cas/login',
   	     :service_validate_url => '/cas/serviceValidate'