Release v1.5.0 notes

Change-Id: Id2eb1bd8ffbc0ff8e19722afa051fc10bac9c3e5

Author: mattcary

CHANGELOG/CHANGELOG-1.5.md

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+# v1.5.0 - Changelog since v1.4.1
+
+## Changes by Kind
+
+### Feature
+
+- Add parameters to VolumeSnapshotClass for disk image config. ([#926](https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/926), [@luohao](https://github.com/luohao))
+
+### Bug or Regression
+
+- Fix ControllerUnpublish backoff ([#953](https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/953), [@saikat-royc](https://github.com/saikat-royc))
+
+### Documentation
+
+- Adds documentation for how to use the PD CSI Driver overlays for testing and deploying the driver. ([#932](https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/932), [@amacaskill](https://github.com/amacaskill))
+
+## Dependencies
+
+### Added
+_Nothing has changed._
+
+### Changed
+_Nothing has changed._
+
+### Removed
+- github.com/GoogleCloudPlatform/guest-configs: [a0dacef](https://github.com/GoogleCloudPlatform/guest-configs/tree/a0dacef)