Add changelog for v1.2

Author: xing-yang

CHANGELOG-1.2.md

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+# Changelog since v1.1.0
+
+## Bug Fixes
+
+- Changes the API group name for the fake VolumeSnapshot object to "snapshot.storage.k8s.io" to be in-sync with the group name of the real VolumeSnapshot object. As a result, the generated interfaces for clientset and informers of VolumeSnapshot are also changed from "VolumeSnapshot" to "Snapshot". ([#123](https://github.com/kubernetes-csi/external-snapshotter/pull/123), [@xing-yang](https://github.com/xing-yang))
+
+
+## Other Notable Changes
+
+- Add Status subresource for VolumeSnapshot. ([#121](https://github.com/kubernetes-csi/external-snapshotter/pull/121), [@zhucan](https://github.com/zhucan))