[Snyk] Security upgrade yargs from 15.4.1 to 16.0.0#210

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-05e7f0cb4b43bbe4d07a3f38e1e5e7e8

+1-1

Commits on Nov 17, 2020

fix: packages/gatsby-cli/package.json to reduce vulnerabilities
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