Add 1.3 changelog

CHANGELOG-1.3.md

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+# Changelog since v1.2.0
+
+## Breaking Changes
+
+- The alpha resizer secret name and namespace keys have been changed from the following values:
+    - `csi.storage.k8s.io/resizer-secret-name`
+    - `csi.storage.k8s.io/resizer-secret-namespace`
+
+  to be the following values:
+    - `csi.storage.k8s.io/controller-expand-secret-name`
+    - `csi.storage.k8s.io/controller-expand-secret-namespace`
+
+  This is a breaking change and is being introduced so that these keys match the naming convention for other secret name/namespace keys. ([#301](https://github.com/kubernetes-csi/external-provisioner/pull/301), [@ggriffiths](https://github.com/ggriffiths))
+
+## New Features
+
+- A new flag --leader-election-namespace is introduced to allow the user to set where the leader election lock resource lives. ([#296](https://github.com/kubernetes-csi/external-provisioner/pull/296), [@verult](https://github.com/verult))
+- Adds CSI Migration support for Azure Disk/File, adds some backwards compatibility fixes for GCE PD Migration ([#292](https://github.com/kubernetes-csi/external-provisioner/pull/292), [@davidz627](https://github.com/davidz627))
+- Add strict topology option that restricts requisite topology to the selected node topology during delayed binding ([#282](https://github.com/kubernetes-csi/external-provisioner/pull/282), [@avalluri](https://github.com/avalluri))
+- Add volume provisioning secret templating for storage class parameters: "provisioner-secret-name" and "provisioner-secret-namespace" ([#274](https://github.com/kubernetes-csi/external-provisioner/pull/274), [@ggriffiths](https://github.com/ggriffiths))
+- Adds the ability to handle PVC as a DataSource to enable cloning for plugins that support it.  ([#220](https://github.com/kubernetes-csi/external-provisioner/pull/220), [@j-griffith](https://github.com/j-griffith))
+
+## Bug Fixes
+
+- Fixes issue where leader election in the CSI provisioner and lib-external-provisioner conflicts. ([#296](https://github.com/kubernetes-csi/external-provisioner/pull/296), [@verult](https://github.com/verult))
+
+