Add changelog

Author: davidh44

.changes/next-release/feature-AWSSDKforJavav2MigrationTool-94848a6.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "AWS SDK for Java v2 Migration Tool",
+    "contributor": "",
+    "description": "General availability release of the AWS SDK for Java v2 migration tool that automatically migrates applications from the AWS SDK for Java v1 to the AWS SDK for Java v2."
+}