Github user khalidhuseynov commented on the issue:
https://github.com/apache/zeppelin/pull/1007
the reason is quite simple, that's to have only one interface to be
implemented (instead of choosing from two, given that documentation doesn't
mention `NotebookRepoVersioned` so far). Also I believe that would encourage to
implement versioning on more storages. @bzz what do you think?
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