CHANGELOG-2.0.md: initial change log for 2.0.x

Author: pohly

CHANGELOG-2.0.md

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+# Changelog since v2.0.0
+
+## Other Notable Changes
+* csi-sanity: support topology during node testing ([#200](https://github.com/kubernetes-csi/csi-test/pull/200))
+* csi-sanity: avoid leaking volumes during volume list testing ([#195](https://github.com/kubernetes-csi/csi-test/pull/195))
+* csi-sanity: enable reuse of more methods ([#193](https://github.com/kubernetes-csi/csi-test/pull/193))
+* csi-sanity: use correct path during cleanup ([#187](https://github.com/kubernetes-csi/csi-test/pull/187))