[GitHub] flink issue #4794: [build][minor] Add missing licenses

[yew1eb]

Github user yew1eb commented on the issue:

    https://github.com/apache/flink/pull/4794
  
    @StephanEwen, @greghogan , I'm sorry to reply late, a little busy recently.
    
    Stephan, I agree with you. 
    
    This PR has been updated.


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