License header in files contradicts LICENSE file

[Oberon00]

The README.md and LICENSE file state that this project is under Apache 2 license. However, the Python files have a header that says "All rights reserved", e.g.

aws-lambda-python-runtime-interface-client/awslambdaric/bootstrap.py

Line 2 in c92c8ad

Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.

One of these has to be wrong, please resolve the contradiction, otherwise using the code for things other than just looking at it seems dangerous 😃

I guess https://github.com/aws/aws-lambda-python-runtime-interface-client/blob/c92c8ad948aff410563aa515c4834dc945610d74/NOTICE needs to be updated too.

[Oberon00]

Hmm, apparently its not really a contradiction (https://opensource.stackexchange.com/questions/2121/mit-license-and-all-rights-reserved), but without at least also mentioning the Apache License, it's at least misleading IMHO