v0.6.2

• New: some demand sources' tracking notices are now requested by the
  device, as the iOS SDK has done since 0.6.0. A few networks only count a
  render, impression or click when the URL is fetched by the device that saw
  the ad rather than by Elo's servers. Where a creative carries such notices,
  the SDK now requests them itself, at the moment each one names, and at most
  once per showing. They carry none of the SDK's headers or session data, only
  the device's default HTTP agent, and their outcome does not affect Elo's own
  tracking or any callback your app receives. Creatives without them, still
  the majority, are unchanged. No public API changes.