Wavefront-sdk-python

- Add authentication support for VMware Cloud Services
- A new metric tag with name `authType` is added to all the sdk internal metrics which identified the type of authentication used.
- Remove `python 3.7` support as it has EOL'd.

**Full Changelog**: https://github.com/wavefrontHQ/wavefront-sdk-python/compare/v2.0.0...v2.1.0

- Use `requests.Session` in `WavefrontClient` to keep connections alive;
- Keep track of created clients in the `WavefrontClientFactory` instance;
- No direct use of `WavefrontDirectClient` or `WavefrontProxyClient`.

Detailed diff since the last release: https://github.com/wavefrontHQ/wavefront-sdk-python/compare/v1.8.15...v2.0.0

- Use `equests.Session` in WavefrontClient

Detailed diff since the last release: https://github.com/wavefrontHQ/wavefront-sdk-python/compare/v1.8.15...v1.9.0

- Aria Operations for Applications Rebranding

Detailed changes since last release https://github.com/wavefrontHQ/wavefront-sdk-python/compare/v1.8.12...v1.8.15

CI/CD updates
- Fix CI so that it runs when PRs are updated as well as created

Documentation updates
- README file updates: Include release instructions.

Enhancements
- Add version tag to internal metrics which contains the API version of this library.

Detailed changes since last release https://github.com/wavefrontHQ/wavefront-sdk-python/compare/v1.8.10...v1.8.12

CI/CD updates
- Switch to github actions from TravisCI

Documentation updates
- README file updates
- Simplify example code

Enhancements
- Allow caller to provide custom queue implementation for sending telemetry data
- Use re-entrant locks internally

Bug fixes
- Include span lines in span logs

Detailed changes since last release https://github.com/wavefrontHQ/wavefront-sdk-python/compare/v1.8.2...v1.8.10