v0.2.0

• Feature / BC break: Update SocketClient to v0.7 or v0.6 and
  use connect($uri) instead of create($host, $port)
  (#8 by @clue)

  // old
  $connector->create($host, $port)->then(function (Stream $conn) {
      $conn->write("…");
  });
  
  // new
  $connector->connect($uri)->then(function (ConnectionInterface $conn) {
      $conn->write("…");
  });

• Improve test suite by adding PHPUnit to require-dev
  (#7 by @clue)