tracing-honeycomb 0.4.1

(0.4.0 was yanked as it was done from the wrong git commit.)

Additions

• New Builder struct for constructing the hOneycombTelemetry instance, which now supports multiple reporting backends.
• New StdoutReporter backed for use in AWS Lambda and similar environments.
  • See https://docs.honeycomb.io/getting-data-in/integrations/aws/aws-lambda/