[Snyk] Security upgrade yargs from 15.4.1 to 16.0.0#183

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-a74cbbce797bb1b2d71d393a83441c68

+1-1

Commits on Nov 10, 2020

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