Added changelog

CHANGELOG.md

@@ -0,0 +1,4 @@
+## 0.0.5 [unreleased]
+
+- Added support for Rails 4.2
+- Added `user_class` option

README.md

@@ -124,7 +124,7 @@ Blazer.audit = false
 Custom user class
 
 ```ruby
-Blazer.user_class = 'MyNamespace::MyClass'
+Blazer.user_class = "Admin"
 ```
 
 Customize user name
@@ -145,6 +145,10 @@ Blazer.user_name = :first_name
 - favorites
 - support for multiple data sources
 
+## History
+
+View the [changelog](https://github.com/ankane/blazer/blob/master/CHANGELOG.md)
+
 ## Thanks
 
 Blazer uses a number of awesome, open source projects.