[Snyk] Upgrade markdownlint from 0.12.0 to 0.20.4#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-3a4b5b1029fdeba0683b2ec41b1aed05

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Commits on Aug 26, 2020

fix: upgrade markdownlint from 0.12.0 to 0.20.4
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