[Snyk] Upgrade gulp-minify-css from 0.3.13 to 0.5.1#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-c0343ac75e86045dbb5db438d2b33898

+1-1

Commits on Apr 11, 2020

fix: upgrade gulp-minify-css from 0.3.13 to 0.5.1
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