[Snyk] Security upgrade gatsby from 1.9.279 to 2.0.84#187

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-b68b4b2e049ee626fa1e1fc3c5b439ea

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Commits on Mar 12, 2020

fix: examples/using-emotion-prismjs/package.json to reduce vulnerabilities
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