Release v1.6.0 notes

Change-Id: I5cb9910a2c3beac3e97969823ba59f5e7e31c4c6

Author: pwschuurman

CHANGELOG/CHANGELOG-1.6.md

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+**Attention:** 1.6.0 is not a recommended version to use because of known issues where pods can get stuck (due to controller publish/unpublish failures) during cluster upgrades or during node reboot (as seen in [#987](https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/987)). Users should upgrade directly to the 1.7 branch.
+
+
+# v1.6.0 - Changelog since v1.5.1
+
+## Changes by Kind
+
+### Feature
+
+- Allow to specify how frequently to poll for AttachDisk operation status, or any other global\regional\zonal operation. ([#956](https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/956), [@sagor999](https://github.com/sagor999))
+
+### Bug or Regression
+
+- Default to MAXPROCS=1 to improve memory usage on nodes with many CPUs. ([#969](https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/969), [@mattcary](https://github.com/mattcary))
+
+### Uncategorized
+
+- Lets users clone a regional disk from a zonal disk if one of the replica zones of the clone matches the zone of the source disk. ([#890](https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/890), [@amacaskill](https://github.com/amacaskill))
+
+## Dependencies
+
+### Added
+_Nothing has changed._
+
+### Changed
+- github.com/prometheus/client_golang: [v1.11.0 → v1.11.1](https://github.com/prometheus/client_golang/compare/v1.11.0...v1.11.1)
+
+### Removed
+_Nothing has changed._