Add changelog for release 2.0

Author: xing-yang

CHANGELOG-1.3.md

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+# Changelog since v1.2.0
+
+## New Features
+
+- Add prometheus metrics to CSI external-snapshotter under the /metrics endpoint. This can be enabled via the "--metrics-address" and "--metrics-path" options. ([#227](https://github.com/kubernetes-csi/external-snapshotter/pull/227), [@saad-ali](https://github.com/saad-ali))
+- Split the external-snapshotter sidecar controller into two controllers, a snapshot-controller and an external-snapshotter sidecar. Only the external-snapshotter sidecar should be deployed with the CSI driver. ([#182](https://github.com/kubernetes-csi/external-snapshotter/pull/182), [@xing-yang](https://github.com/xing-yang))
+- Add a finalizer on VolumeSnapshot object to protect it from being deleted when it is bound to
+ a VolumeSnapshotContent. ([#182](https://github.com/kubernetes-csi/external-snapshotter/pull/182), [@xing-yang](https://github.com/xing-yang))
+
+### Breaking Changes
+
+- Changes VolumeSnapshot CRD version from v1alpha1 to v1beta1. v1alpha1 is no longer supported. ([#139](https://github.com/kubernetes-csi/external-snapshotter/pull/139), [@xing-yang](https://github.com/xing-yang))
+- Add a prefix "external-snapshotter-leader" and the driver name to the snapshotter leader election lock name. Rolling update will not work if leader election is enabled because the lock name is changed in v2.0.0. ([#129](https://github.com/kubernetes-csi/external-snapshotter/pull/129), [@zhucan](https://github.com/zhucan))
+
+### Other Notable Changes
+
+- Removes createSnapshotContentRetryCount and createSnapshotContentInterval
+  from command line options. ([#211](https://github.com/kubernetes-csi/external-snapshotter/pull/211), [@xing-yang](https://github.com/xing-yang))
+- Migrated to Go modules, so the source builds also outside of GOPATH. ([#179](https://github.com/kubernetes-csi/external-snapshotter/pull/179), [@pohly](https://github.com/pohly))