v1.7.0

• Feature: Simplify usage by supporting new default loop and making Connector optional.
  (#41 and #42 by @clue)

  // old (still supported)
  $proxy = new Clue\React\HttpProxy\ProxyConnector(
      '127.0.0.1:8080',
      new React\Socket\Connector($loop)
  );
  
  // new (using default loop)
  $proxy = new Clue\React\HttpProxy\ProxyConnector('127.0.0.1:8080');

• Documentation improvements and updated examples.
  (#39 and #43 by @clue and #40 by @PaulRotmann)

• Improve test suite and use GitHub actions for continuous integration (CI).
  (#38 by @SimonFrings)