v0.2.0

Added

• Priority sampling of distributed traces is now supported by sending the
  priorty field from the Trace along with each Span sent to Datadog,
  using the appropriate _sampling_priority_v1 field under the metrics
  field.

Changed

• If the env option is not specified for a trace, it will no longer be sent
  to Datadog, This allows the Datadog trace collector configured default to be
  used, if desired.
• SpandexDatadog.Adapter.distributed_context/2 now returns a Spandex.Trace
  struct, including a priority based on the x-datadog-sampling-priority
  HTTP header.
• SpandexDatadog.ApiServer now supports the send_trace function, taking a
  Spandex.Trace struct.

Deprecated

• SpandexDatadog.ApiServer.send_spans/2 is deprecated in favor of
  SpandexDatadog.ApiServer.send_trace/2.