Security vulnerability in `concurrently` -> `tree-kill`

[twalker]

A security vulnerability has recently been reported for a nested dependency:
nps-utils> concurrently > tree-kill
https://npmjs.com/advisories/1432

Concurrently has updated it's dependencies to address the vulnerability:
https://github.com/kimmobrunfeldt/concurrently/releases/tag/v5.0.2

Updating to concurrently@v5.0.2 ought to remediate the vulnerability.
I attempted to do so in a fork, but tests fail for me so I can't confidently make the updates.

Thank you for this great project along with nps, it's really brought clarity to npm scripts in my projects.