Wavefront-sdk-python

- Documentation fixes;
- Bug fixes involving certain race conditions.

Detailed changes since last release https://github.com/wavefrontHQ/wavefront-sdk-python/compare/v1.8.0...v1.8.2

- `WavefrontDirectClient` and `WavefrontProxyClient` are deprecated in favor of unified `WavefrontClient`


Detailed changes since last release https://github.com/wavefrontHQ/wavefront-sdk-python/compare/v1.7.4...v1.8.0

* Added support for sending events.
* Added support for setting custom tags with environment variables.
* Minor Fixes and Improvements.

- Minor Fixes and Improvements.

- Update Wavefront Span Log key value.
- Minor Fixes and Improvements.