v1.4.0

• Feature: Update DNS dependency to support loading system default DNS
  nameserver config on all supported platforms
  (/etc/resolv.conf on Unix/Linux/Mac/Docker/WSL and WMIC on Windows)
  (#23 by @clue)

  This means that connecting to hosts that are managed by a local DNS server,
  such as a corporate DNS server or when using Docker containers, will now
  work as expected across all platforms with no changes required:

  $factory = new Factory($loop);
  $factory->createClient('intranet.example:5353');

• Improve README
  (#22 by @jsor)