Updated change log with cURLFormatter and BufferedStream

Author: Nyholm

CHANGELOG.md

@@ -1,10 +1,12 @@
 # Change Log
 
-## Unreleased
+## 1.4.0 - 2016-10-17
 
 ### Added
 
 - Message, stream and URI factories for [Slim Framework](https://github.com/slimphp/Slim)
+- BufferedStream that allow you to decorate a non-seekable stream with a seekable one.
+- cUrlFormatter to be able to redo the request with a cURL command
 
 ## 1.3.1 - 2016-07-15