[Snyk] Security upgrade koa-ratelimit from 4.0.0 to 4.1.0#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-f7932397e7d17a4e17e4801279787664

+175-208

Commits on Jul 18, 2020

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