[Snyk] Security upgrade nodemailer from 5.1.1 to 6.4.16#3

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-0594e0b532fa980d7062859a1376a574

+5-5

Commits on Nov 18, 2020

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