Add a changelog for 0.2.0

Author: gnufied

CHANGELOG-0.2.0.md

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+# v0.2.0
+
+
+## Support Status
+
+Alpha
+
+
+## New Features
+
+- Implement CSI migration logic for volume resizing ([#39](https://github.com/kubernetes-csi/external-resizer/pull/39), [@leakingtapan](https://github.com/leakingtapan))
+
+
+## Other Notable Changes
+
+- Read volume expansion secrets from Persistent Volume Source ([#42](https://github.com/kubernetes-csi/external-resizer/pull/42), [@gnufied](https://github.com/gnufied))
+
+