Update 3 files

Daniel Cothranrequested to merge
issue/charts_highcharts_drilldown-3398093:3398093-update-the-highcharts into 1.0.x
  • /charts_highcharts_drilldown.libraries.yml
  • /charts_highcharts_drilldown.module
  • /README.md

Closes #3398093

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