README.md in option-0.3.1 vs README.md in option-0.4.0

@@ -1,10 +1,12 @@
 # Option
 
-A Ruby port os Scala's Option monad. Tries to be faithful
-but also pragmatic in RE: to ducktyping.
+A Ruby port of Scala's Option monad. Tries to be faithful
+but also pragmatic in RE: to duck typing.
 
+Blog post: http://robares.com/2012/09/16/ruby-port-of-scala-option/
+
 ## Installation
 
 Add this line to your application's Gemfile:
 
     gem 'option'
@@ -52,13 +54,19 @@
 # attempt to extract a value but default if None
 None.fold(-> { "missing" }) { |v| v.upcase } #=> missing
 
 # filter values returning an option
 foo.filter { |v| v == "baz" } #=> None
+
+# mutation
+foo.inside { |v| v.upcase! } #=> Some("BAR")
 ```
 
 ## Build Status
-<a href="http://travis-ci.org/rares/option">![http://travis-ci.org/rares/option](https://secure.travis-ci.org/rares/option.png)</a>
+[![Travis CI](https://secure.travis-ci.org/rares/option.png)](http://travis-ci.org/rares/option)
+
+## Code Climate
+[![Code Climate](https://codeclimate.com/badge.png)](https://codeclimate.com/github/rares/option)
 
 ## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)