install.rst in squib-0.12.0

- old
+ new

@@ -11,10 +11,12 @@
 Squib works with both x86 and x86_64 versions of Ruby.
 
 Typical Install
 ---------------
 
-Regardless of your OS, installation is::
+Regardless of your OS, installation is
+
+.. code-block:: none
 
   $ gem install squib
 
 If you're using `Bundler <http://bundler.io>`_, add this line to your application's Gemfile::
 