[Snyk] Security upgrade gulp-imagemin from 4.1.0 to 5.0.0#123

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-4174548ef3bc2a622e64e4434568f43f

+1,053-696

Commits on Apr 3, 2020

fix: package.json & yarn.lock to reduce vulnerabilities
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