update changelog in preparation of the v17.17.0 release
# v17.0.0-snapshot
-Kubernetes API Version: To Be Updated
+Kubernetes API Version: 1.17.17
+
+Changelog since v17.17.0b1:
### Bug or Regression
- Fix watch stream non-chunked response handling ([kubernetes-client/python-base#231](https://github.com/kubernetes-client/python-base/pull/231), [@dhague](https://github.com/dhague))
