Netflix-spectator-py

Primary changes:

- 14, fix use of stopwatch method with PercentileTimer.

A comprehensive list of changes can be found in the commit log: https://github.com/Netflix/spectator-py/compare/v0.1.8...v0.1.9

Primary changes:

- 11, add support for percentile approximations.

A comprehensive list of changes can be found in the commit log: https://github.com/Netflix/spectator-py/compare/v0.1.7...v0.1.8

Primary changes:

- Verify secondary team member can publish a release.

A comprehensive list of changes can be found in the commit log: https://github.com/Netflix/spectator-py/compare/v0.1.6...v0.1.7

Primary changes:

- 6, send measurements in batches to avoid hitting max entity size on the server if there are many metrics.