[GitHub] flink issue #5924: [hotfix][README.md] Update building prerequisites

[W4anD0eR96]

Github user W4anD0eR96 commented on the issue:

    https://github.com/apache/flink/pull/5924
  
    @tzulitai 
    
    This is quite a small modify. If you think that it is meaningless, let me 
know please.


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