[Snyk] Upgrade gulp from 4.0.0 to 4.0.2#5

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-2cc339ac99e9025c3767c54791abc594

+147-137

Commits on Feb 22, 2020

fix: upgrade gulp from 4.0.0 to 4.0.2
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