[GitHub] zeppelin issue #3033: ZEPPELIN-3551. Upgrade Scala to 2.11.12

[zjffdu]

Github user zjffdu commented on the issue:

    https://github.com/apache/zeppelin/pull/3033
  
    Thanks @felixcheung , I will revert the change in the root pom file and 
only update scala version in spark module. 


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