v1.8.0

A major new feature release, see release announcement.

• Feature: Simplify usage by supporting new default loop.
  (#260 by @clue)

  // old (still supported)
  $socket = new React\Socket\Server('127.0.0.1:8080', $loop);
  $connector = new React\Socket\Connector($loop);
  
  // new (using default loop)
  $socket = new React\Socket\Server('127.0.0.1:8080');
  $connector = new React\Socket\Connector();