[Snyk] Security upgrade highcharts from 7.1.1 to 8.1.1#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-036dc6e5da560b7f67e04e0792fc8700

+4-4

Commits on Jun 12, 2020

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