Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/vendor/guzzlehttp/streams/README.rst

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+==============
+Guzzle Streams
+==============
+
+Provides a simple abstraction over streams of data.
+
+This library is used in `Guzzle 5 <https://github.com/guzzle/guzzle>`_, and is
+(currently) compatible with the WIP PSR-7.
+
+Installation
+============
+
+This package can be installed easily using `Composer <http://getcomposer.org>`_.
+Simply add the following to the composer.json file at the root of your project:
+
+.. code-block:: javascript
+
+    {
+      "require": {
+        "guzzlehttp/streams": "~3.0"
+      }
+    }
+
+Then install your dependencies using ``composer.phar install``.
+
+Documentation
+=============
+
+The documentation for this package can be found on the main Guzzle website at
+http://docs.guzzlephp.org/en/guzzle4/streams.html.
+
+Testing
+=======
+
+This library is tested using PHPUnit. You'll need to install the dependencies
+using `Composer <http://getcomposer.org>`_ then run ``make test``.