[Snyk] Upgrade highcharts-grouped-categories from 1.1.2 to 1.1.6#2

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snyk-bot wants to merge 1 commit intomainfrom snyk-upgrade-498ea48b9b24855f679ae48c434ac5f9

+1-1

Commits on Aug 6, 2020

fix: upgrade highcharts-grouped-categories from 1.1.2 to 1.1.6
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