[Snyk] Upgrade @graphprotocol/graph-cli from 0.18.0 to 0.20.0#1

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-b42066531a884cc4dfd45b04f26521f9

+68-94

Commits on May 22, 2021

fix: upgrade @graphprotocol/graph-cli from 0.18.0 to 0.20.0
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