[Snyk] Upgrade tslint from 5.12.1 to 5.20.1#6

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-7a6763d7fc11c0667bffdab1afafdbad

+69-100

Commits on Mar 18, 2020

fix: upgrade tslint from 5.12.1 to 5.20.1
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