Merge remote-tracking branch 'origin/duplex-interface'

* origin/duplex-interface:
  Added DuplexStreamInterface

Author: igorw

src/CompositeStream.php

@@ -4,7 +4,7 @@
 
 use Evenement\EventEmitter;
 
-class CompositeStream extends EventEmitter implements ReadableStreamInterface, WritableStreamInterface
+class CompositeStream extends EventEmitter implements DuplexStreamInterface
 {
     protected $readable;
     protected $writable;

src/DuplexStreamInterface.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace React\Stream;
+
+interface DuplexStreamInterface extends ReadableStreamInterface, WritableStreamInterface
+{
+}

src/Stream.php

@@ -5,7 +5,7 @@
 use Evenement\EventEmitter;
 use React\EventLoop\LoopInterface;
 
-class Stream extends EventEmitter implements ReadableStreamInterface, WritableStreamInterface
+class Stream extends EventEmitter implements DuplexStreamInterface
 {
     public $bufferSize = 4096;
     public $stream;