docs(): updated the formatting and added newest changes

CHANGELOG.md

@@ -1,34 +1,56 @@
 # CHANGELOG
 
-## 3.1.3 ( March 15, 2017 )
-- in interceptors, you can use `getAction` to receive action which triggered interceptors, for now, bug with `action` will not be removed, but it'll be removed in 4.0 as it is breaking change
+## 4.0.0
+#### _Mar 14, 2017_
+
+##### Breaking Changes
+- [interceptors] We have replaced the `action` parameter with a new `getSourceAction` function which will return the action which triggered the interceptor. [#33](https://github.com/svrcekmichal/redux-axios-middleware/issues/33) [#34](https://github.com/svrcekmichal/redux-axios-middleware/issues/34)
+
+##### Docs
+- Updated the changelog formatting.
+
+## 3.1.2
+#### _Feb 20, 2017_
 
-## 3.1.2 ( Feb 20, 2017 )
 - exclude our .babelrc from our npm build.
 
-## 3.1.1 ( Feb 17, 2017 )
+## 3.1.1
+#### _Feb 17, 2017_
+
 - corrected the entry for the webpack config
 
-## 3.1.0 ( Feb 17, 2017 )
+## 3.1.0
+#### _Feb 17, 2017_
+
 - add webpack build to support UMD [#40](https://github.com/svrcekmichal/redux-axios-middleware/issues/40)
 - exported success and error suffixes [#42](https://github.com/svrcekmichal/redux-axios-middleware/issues/42)
 
-## 3.0.0 ( Sep 8, 2016 )
+## 3.0.0
+#### _Sep 8, 2016_
+
 - changed default action prefixing
 
-## 2.0.0 ( Aug 10, 2016 )
+## 2.0.0
+#### _Aug 10, 2016_
+
 - changes to support [email protected]
 - removed enhanced getState function as first interceptor argument
 
-## 1.3.0 ( Jun 14, 2016 )
+## 1.3.0
+#### _Jun 14, 2016_
+
 - added warning to not use first interceptor argument as `getState` function
 - added `dispatch` and `action` to first interceptor argument - [#26](https://github.com/svrcekmichal/redux-axios-middleware/pull/26)
 
-## 1.2.0 ( Jun 7, 2016 )
+## 1.2.0
+#### _Jun 7, 2016_
+
 - provide ability to specify failure interceptors that run when request fails [#20](https://github.com/svrcekmichal/redux-axios-middleware/issues/20)
 - fixed interceptors default values
 
-## 1.1.0 ( Jun 1, 2016 )
+## 1.1.0
+#### _Jun 1, 2016_
+
 - support for multiple client [#6](https://github.com/svrcekmichal/redux-axios-middleware/issues/6)
 - configuration of middleware on all layers (middleware, client, action) 
 - Fixes throw uncaught exception in axios error with `returnRejectedPromiseOnError` options