please update / align the released versions (github, storybook, npm)

[watery]

The latest tagged release here on GitHub is 0.5.11:
https://github.com/IBM/gantt-chart/releases

the storybook reports a 0.5.9:
https://ibm.github.io/gantt-chart/packages/ibm-gantt-chart-docs/storybook/?path=/story/guides-introduction--getting-started

NPM seems to be the most up-to-date, listing version 0.5.27:
https://www.npmjs.com/package/ibm-gantt-chart