1.3.9 release notes

Forward-port of `831a6aef2e96b1d68a0d20a0b65b39abc5c282ba`

Author: Ocramius

CHANGELOG.md

@@ -20,7 +20,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 - Nothing.
 
-## 1.3.9 - TBD
+## 1.3.10 - TBD
 
 ### Added
 
@@ -38,6 +38,27 @@ All notable changes to this project will be documented in this file, in reverse
 
 - Nothing.
 
+## 1.3.9 - 2017-01-17
+
+### Added
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- [#223](https://github.com/zendframework/zend-diactoros/issues/223)
+  [#224](https://github.com/zendframework/zend-diactoros/pull/224) fixed an issue
+  with the `SapiStreamEmitter` consuming too much memory when producing output
+  for readable bodies.
+
 ## 1.3.8 - 2017-01-05
 
 ### Added