[Snyk] Upgrade npm from 6.10.3 to 6.13.4#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-7abdfe930a7b35b3be7e5f45bb5f962b

+117-101

Commits on Jan 7, 2020

fix: upgrade npm from 6.10.3 to 6.13.4
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