[Snyk] Security upgrade rdflib from 0.17.1 to 0.19.0#29

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-0f251d6b48833f565fcf542e6d9f7ad9

+287-532

Commits on Sep 12, 2020

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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