Sonobuoy v0.16.0

This release corresponds to the Kubernetes v1.16.0 release. It takes place very close to our previous release, Sonobuoy v0.15.4, and does not contain any user-facing changes other than supporting Kubernetes v1.16.x.

Changelog

6db0b0b Prepare v0.16.0 release (#896)
b0fb524 Rename stress test directory to match package name (#893)
0b77329 Fix script to make new versioned docs (#892)