[Snyk] Security upgrade yargs-unparser from 1.6.0 to 1.6.4#9

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-905b63bbc818e1b80d84ccd0e869de70

+26-34

Commits on Oct 2, 2020

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