README.md in hashid-rails-0.2.0 vs README.md in hashid-rails-0.3.0

@@ -17,15 +17,19 @@
 gem 'hashid-rails'
 ```
 
 And then execute:
 
-    $ bundle
+```shell
+$ bundle
+```
 
 Or install it yourself as:
 
-    $ gem install hashid-rails
+```shell
+$ gem install hashid-rails
+```
 
 ## Usage
 
 Just use `Model#find` passing in the hashid instead of the model id:
 
@@ -40,9 +44,12 @@
 
 ```ruby
 Hashid::Rails.configure do |config|
   config.secret = 'my secret'
   config.length = 6
+  # config.alphabet is optional, hashids provides a default
+  # alphabet that consists of all characters [a-zA-Z0-9]
+  config.alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
 end
 ```
 
 ## Development