Merge pull request #184 from xing-yang/release-0.4

Add changelog for v0.4.2

Author: k8s-ci-robot

CHANGELOG-0.4.md

@@ -0,0 +1,14 @@
+# Changelog since v0.4.1
+
+## Notable Changes
+
+- Cherry picks PR #172: Added extra verification of source PersistentVolumeClaim before creating snapshot.([#180](https://github.com/kubernetes-csi/external-snapshotter/pull/180), [@xing-yang](https://github.com/xing-yang))
+
+# Changelog since v0.4.0
+
+## Important changes
+
+- Cherry pick PR #37: Update vendor files to point to K8S 1.12.0.([#42](https://github.com/kubernetes-csi/external-snapshotter/pull/42), [@xing-yang](https://github.com/xing-yang))
+
+# Release v0.4.0
+- First release!