[Snyk] Security upgrade react-markdown from 3.6.0 to 5.0.0#412

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-5ccadfa6d14de2e445fc7dfe52ad1617

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Commits on Nov 6, 2020

fix: examples/using-gatsby-source-graphql/package.json to reduce vulnerabilities
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