Release v0.4.2

Minor improvement to operation_name_override behaviour.

Release v0.4.1

Inject/extract methods can be configured with env vars.

Release v0.4.0

• Fixes propagation header whitelist, removing log spam
• Setting the 'error' tag will show errors in Datadog UI
• Improvements to CMAKE config
• Change environment setting tag to 'env'

Release v0.3.7

NGINX module now does not require seperate nginx-opentracing and dd-opentracing-cpp.

Release v0.3.6

• Adds support for injecting agent address details via environment variables
• Applies span options when starting traces
• Improvement to project docs

Release v0.3.5

• Try to flush traces on tracer Close()
• Increase Envoy performance

Release v0.3.4

* Adds debug symbols to release build (optimized code with debug symb…

Release v0.3.3

* Fixes compilation issue for "mismatched tags"

* Updates CI jobs to prevent future build issues for "mismatched tags"

Release v0.3.2

* SamplingPriority refactor and support for UserKeep and UserDrop

* Allow setting the sampling.priority tag to enable user sampling
* Integration for bazel in CI jobs
* Minor improvements driven by hardened compiler options

Release v0.3.1

Fixes envoy generic OpenTracing implementation (first class support was always fine)