• BC break: [EventLoop] New timers API (@nrk)
• BC break: [EventLoop] Remove check on return value from stream callbacks (@nrk)
• BC break: [HttpClient] Socket connection handling moved to new SocketClient component
• Feature: [SocketClient] New SocketClient component extracted from HttpClient (@clue)
• Feature: [Stream] Factory method for BufferedSink

EventLoop

• The timer callback now receives a Timer instance, with the following
  useful methods:

  • cancel
  • isActive
  • setData($data)
  • getData

  And some other less common ones. These are prefered over
  LoopInterface::cancelTimer and LoopInterface::isTimerActive.

• You can no longer return a boolean from a periodic timer callback to abort
  it.

HttpClient

• HttpClient\*ConnectionManager has been moved to SocketClient\*Connector,
  and the getConnection method has been renamed to create.

  Before:

  $connectionManager->getConnection($host, $port);

  After:

  $connector->create($host, $port);