Github user Savalek commented on the issue:
https://github.com/apache/zeppelin/pull/3243
Travis tests for this PR failed
[link](https://travis-ci.org/drod331/zeppelin/builds/461127589).
Dependency branch: `npm-run-all` --> `ps-tree` --> `event-stream` -->
`flatmap-stream`.
I'm updated `npm-run-all` version to `4.1.5` ( this version not
include`ps-tree`) and regenerate `package-lock.json'.
And travis checks is OK.
[Travis](https://travis-ci.org/Savalek/zeppelin/builds/461195255?utm_source=github_status&utm_medium=notification)
and
[commit](https://github.com/Savalek/zeppelin/commit/3f7be1c44b4b0030572fb2c7c8b4eb149749a8c0).
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