3.0.4

• #38: The Authentication helpers no longer overwrite any existing
  WWW-Authenticate headers, but instead append new headers. This ensures
  that multiple authentication systems can exist in the same environment.

3.0.3

• Hiding Authorization header value from Request::__toString.

3.0.2

• When parsing Accept: headers, we're ignoring invalid parts. Before we
  would throw a PHP E_NOTICE.

3.0.1

• Minor change in unittests.

3.0.0

• getHeaders() now returns header values as an array, just like psr/http.
• Added hasHeader().

2.1.0-alpha1

• Changed: Copied most of the header-semantics for the PSR draft for
  representing HTTP messages. Reference here.
• This means that setHeaders() does not wipe out every existing header
  anymore.
• We also support multiple headers with the same name.
• Use Request::getHeaderAsArray() and Response::getHeaderAsArray() to
  get a hold off multiple headers with the same name.
• If you use getHeader(), and there's more than 1 header with that name, we
  concatenate all these with a comma.
• addHeader() will now preserve an existing header with that name, and add a
  second header with the same name.
• The message class should be a lot faster now for looking up headers. No more
  array traversal, because we maintain a tiny index.
• Added: URLUtil::resolve() to make resolving relative urls super easy.
• Switched to PSR-4.
• #12: Circumventing CURL's FOLLOW_LOCATION and doing it in PHP instead. This
  fixes compatibility issues with people that have open_basedir turned on.
• Added: Content negotiation now correctly support mime-type parameters such as
  charset.
• Changed: Util::negotiate() is now deprecated. Use
  Util::negotiateContentType() instead.
• #14: The client now only follows http and https urls.

2.0.4

• Changed: No longer escaping @ in urls when it's not needed.
• Fixed: #7: Client now correctly deals with responses without a body.

2.0.3

• Now works on hhvm!
• Fixed: Now throwing an error when a Request object is being created with
  arguments that were valid for sabre/http 1.0. Hopefully this will aid with
  debugging for upgraders.

2.0.2

• Fixed: Potential security problem in the client.

2.0.1

• Fixed: getBodyAsString on an empty body now works.
• Fixed: Version string