[Snyk] Security upgrade lodash from 4.17.11 to 4.17.20#91

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-4b2ed1f5d02545342f7037fc6aa41f79

+4-4

Commits on Aug 17, 2020

fix: backend/package.json & backend/package-lock.json to reduce vulnerabilities
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