[Snyk] Upgrade async from 2.6.0 to 2.6.3#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-5036d6197ec80dbdd828aedb85ab5c12

+59-19

Commits on Mar 9, 2020

fix: upgrade async from 2.6.0 to 2.6.3
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