[Snyk] Security upgrade node-fetch from 1.7.1 to 2.6.1#4

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snyk-fix-e76cf534fc80aba5975ad59fabb5c39e

Commits on Sep 11, 2020

fix: packages/docsify-server-renderer/package.json & packages/docsify-server-renderer/package-lock.json to reduce vulnerabilities
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