3.0.0 (2014-10-12)

• Now supports creating streams from functions and iterators.
• Supports creating buffered streams and asynchronous streams.
• Removed functions.php. Use the corresponding functions provided by GuzzleHttp\Streams\Utils instead.
• Moved GuzzleHttp\Stream\MetadataStreamInterface::getMetadata to GuzzleHttp\Stream\StreamInterface. MetadataStreamInterface is no longer used and is marked as deprecated.
• Added attach() to GuzzleHttp\Stream\StreamInterface for PSR-7 compatibility.
• Removed flush() from StreamInterface.
• Removed the $maxLength parameter from GuzzleHttp\Stream\StreamInterface::getContents(). This function now returns the entire remainder of the stream. If you want to limit the maximum amount of data read from the stream, use the GuzzleHttp\Stream\Utils::copyToString() function.
• Streams that return an empty string, '', are no longer considered a failure. You MUST return false to mark the read as a failure, and ensure that any decorators you create properly return true in response to the eof() method when the stream is consumed.
• GuzzleHttp\Stream\Stream::__construct, GuzzleHttp\Stream\Stream::factory, and GuzzleHttp\Stream\Utils::create no longer accept a size in the second argument. They now accept an associative array of options, including the "size" key and "metadata" key which can be used to provide custom metadata.
• Added GuzzleHttp\Stream\BufferStream to add support for buffering data, and when read, shifting data off of the buffer.
• Added GuzzleHttp\Stream\NullBuffer which can be used as a buffer that does not actually store any data.
• Added GuzzleHttp\Stream\AsyncStream to provide support for non-blocking streams that can be filled by a remote source (e.g., an event-loop). If a drain option is provided, the stream can also act as if it is a blocking stream.

2.1.0 (2014-08-17)

• Added an InflateStream to inflate gzipped or deflated content.
• Added flush to stream wrapper.
• Added the ability to easily register the GuzzleStreamWrapper if needed.

2.0.0 (2014-08-16)

• Deprecated functions.php and moved all of those methods to GuzzleHttp\Streams\Utils. Use GuzzleHttp\Stream\Stream::factory() instead of GuzzleHttp\Stream\create() to create new streams.
• Added flush() to StreamInterface. This method is used to flush any underlying stream write buffers.
• Added FnStream to easily decorate stream behavior with callables.
• Utils::hash now throws an exception when the stream cannot seek to 0.