Use GitHub flavored markdown for syntax highlighting.

Gemfile

@@ -9,5 +9,6 @@ group :development do
   gem 'rspec', '~> 3.0'
 
   gem 'kramdown'
-  gem 'yard',  '~> 0.9'
+  gem 'redcarpet',  platform: :mri
+  gem 'yard',       '~> 0.9'
 end

README.md

@@ -21,56 +21,62 @@ module.
 
 Diff two HTML documents:
 
-    require 'nokogiri'
-    require 'tdiff'
-
-    class Nokogiri::XML::Node
-
-      include TDiff
-
-      def tdiff_equal(node)
-        if (self.text? && node.text?)
-          self.text == node.text
-        elsif (self.respond_to?(:root) && node.respond_to?(:root))
-          self.root.tdiff_equal(node.root)
-        elsif (self.respond_to?(:name) && node.respond_to?(:name))
-          self.name == node.name
-        else
-          false
-        end
-      end
+```ruby
+require 'nokogiri'
+require 'tdiff'
+
+class Nokogiri::XML::Node
+
+  include TDiff
+
+  def tdiff_equal(node)
+    if (self.text? && node.text?)
+      self.text == node.text
+    elsif (self.respond_to?(:root) && node.respond_to?(:root))
+      self.root.tdiff_equal(node.root)
+    elsif (self.respond_to?(:name) && node.respond_to?(:name))
+      self.name == node.name
+    else
+      false
+    end
+  end
 
-      def tdiff_each_child(node,&block)
-        node.children.each(&block)
-      end
+  def tdiff_each_child(node,&block)
+    node.children.each(&block)
+  end
 
-    end
+end
 
-    doc1 = Nokogiri::HTML('<div><p>one</p> <p>three</p></div>')
-    doc2 = Nokogiri::HTML('<div><p>one</p> <p>two</p> <p>three</p></div>')
+doc1 = Nokogiri::HTML('<div><p>one</p> <p>three</p></div>')
+doc2 = Nokogiri::HTML('<div><p>one</p> <p>two</p> <p>three</p></div>')
 
-    doc1.at('div').tdiff(doc2.at('div')) do |change,node|
-      puts "#{change} #{node.to_html}".ljust(30) + node.parent.path
-    end
+doc1.at('div').tdiff(doc2.at('div')) do |change,node|
+  puts "#{change} #{node.to_html}".ljust(30) + node.parent.path
+end
+```
 
 ### Output
 
-    + <p>one</p>                  /html/body/div
-    +                             /html/body/div
-      <p>one</p>                  /html/body/div
-                                  /html/body/div
-      <p>three</p>                /html/body/div
-    - one                         /html/body/div/p[1]
-    + two                         /html/body/div/p[2]
-      three                       /html/body/div/p[2]
+```
++ <p>one</p>                  /html/body/div
++                             /html/body/div
+  <p>one</p>                  /html/body/div
+                              /html/body/div
+  <p>three</p>                /html/body/div
+- one                         /html/body/div/p[1]
++ two                         /html/body/div/p[2]
+  three                       /html/body/div/p[2]
+```
 
 ## Requirements
 
 * [ruby](http://www.ruby-lang.org/) >= 1.8.7
 
 ## Install
 
-    $ gem install tdiff
+```shell
+$ gem install tdiff
+```
 
 ## Copyright