Upgrade shelljs to 0.8.4

[ArchangelX360]

Relates to #684

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[brendandburns]

/lgtm
/approve

Thanks for the PR!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ArchangelX360, brendandburns

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[ArchangelX360]

@brendandburns I had to change the commit message not to include Closes keyword, apologies for asking for a second approval :/.

[brendandburns]

/lgtm