CHANGELOG-2.3.md: content for v2.3.0

Author: pohly

CHANGELOG-2.3.md

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+# Changelog since v2.2.0
+
+## New Features
+
+- add '--csi.testvolumeexpandsize` flag ([#219](https://github.com/kubernetes-csi/csi-test/pull/219), [@wnxn](https://github.com/wnxn))
+- pass ControllerExpandVolumeSecret to volume expansion tests ([#217](https://github.com/kubernetes-csi/csi-test/pull/217), [@suneeth51](https://github.com/suneeth51))
+
+
+## Bug Fixes
+
+- fix nil pointer error when Config.IDGen is not set ([#220](https://github.com/kubernetes-csi/csi-test/pull/220), [@pohly](https://github.com/pohly))
+- fix cloning of first volume in mock CSI driver([#227](https://github.com/kubernetes-csi/csi-test/pull/227), [@avalluri](https://github.com/avalluri))
+
+
+## Other Notable Changes
+
+- add Go module support and thus can be built also outside of GOPATH ([#224](https://github.com/kubernetes-csi/csi-test/pull/224), [@pohly](https://github.com/pohly))
+- disable unreliable ListVolume pagination test ([#226](https://github.com/kubernetes-csi/csi-test/pull/226), [@avalluri](https://github.com/avalluri))