fixup! Add in caching documentation once again

Author: Damian Galarza

README.md

@@ -168,7 +168,7 @@ end
 
 #### Caching
 
-Built in caching support has been removed in HighVoltage. See [PR 221](https://github.com/thoughtbot/high_voltage/pull/221)
+Built in caching support has been removed in HighVoltage. See [PR 221](https://github.com/thoughtbot/high_voltage/pull/221).
 
 Page caching and action caching can be done via Rails. Visit the [Caching with
 Rails: An overview](http://guides.rubyonrails.org/caching_with_rails.html) guide