CHANGE LOG
==========
2020-02-12 - v0.02
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### Added
- `default_context_builder` attribute for `Tracer`,
which allows delaying the building a default context as long as possible.
### Changed
- refactor SpanContext
- refactor Agent
### Added
- increase the number of tests to 42
2020-01-01 - v0.01
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Initial Release