[copyright] Fix the copyright information in windowing code

apache / incubator-heron

Apache Heron (Incubating) is a realtime, distributed, fault-tolerant stream processing engine from Twitter

https://heron.apache.org/

Apache License 2.0

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Closed kramasamy closed 6 years ago

kramasamy commented 6 years ago

Since the windowing code is adopted from Storm and modified, we should include Apache copyright information.

srkukarni commented 6 years ago

This has been fixed