Example code plugin outdated (#8230)
Example code plugin outdated (#8230)

Update example code.
As stated in the migration guide: `All plugin hooks have unified signature with 3 arguments: chart, args and options.`
touletan/Chart.js,touletan/Chart.js,chartjs/Chart.js,chartjs/Chart.js,nnnick/Chart.js,chartjs/Chart.js,chartjs/Chart.js,touletan/Chart.js,touletan/Chart.js