[Snyk] Security upgrade gatsby from 1.9.279 to 2.0.0#184

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-9ebd8dbd5e42d79fa8d4a18e6c99f34a

+16-4

Commits on Feb 24, 2020

fix: examples/using-mongodb/package.json & examples/using-mongodb/.snyk to reduce vulnerabilities
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