Add a link to chartjs-plugin-streaming to extensions.md (#5309)
Add a link to chartjs-plugin-streaming to extensions.md (#5309)


simonbrunel/Chart.js,touletan/Chart.js,simonbrunel/Chart.js,touletan/Chart.js,jtcorbett/Chart.js,chartjs/Chart.js,touletan/Chart.js,jtcorbett/Chart.js,chartjs/Chart.js,touletan/Chart.js,chartjs/Chart.js,chartjs/Chart.js,nnnick/Chart.js