Add license header to scripts

Author: jonathan343

scripts/changelog/new-entry.py

@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
 """
 Create new changelog entries for a specific package.
 """

scripts/changelog/new-release.py

@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
 """
 Create a new release by consolidating changelog entries from next-release directory
 into a version JSON file (x.y.z.json).

scripts/changelog/render.py

@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
 """
 Render changelog entries from version JSON files using Jinja templates.
 """