[Snyk] Security upgrade gatsby from 2.0.19 to 2.0.84#13

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-bd1f80b81eb32c175ba1643096f8583b

+10,135-3,394

Commits on Jul 17, 2020

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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