Add unreleased change to CHANGELOG.md

Author: shulard

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Change Log
 
+## [Unreleased]
+
+### Fixed
+
+- Issue with `react/http-client` v0.4.13 about body handling as StreamInterface.
+This change was introduce in https://github.com/reactphp/http-client/pull/66.
+
+### Changed
+
+- Client now require a Stream factory to handle body properly.
+
 
 ## 0.2.2 - 2016-07-18