[Snyk] Upgrade gulp from 4.0.0 to 4.0.2#3

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-ec9c391d3fd8b46b1adec2be24e84957

+269-279

Commits on Oct 26, 2019

chore: upgrade gulp from 4.0.0 to 4.0.2
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