[Snyk] Security upgrade yargs from 8.0.2 to 13.1.0#209

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-077e3fcad2da7df3daa66a5dd4c32f43

+1-1

Commits on Mar 16, 2020

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