Along with the change of Google Chrome 72, the SDP format will be switched from Plan B to Unified Plan. Check the https://webrtc.org/web-apis/chrome/unified-plan/ for details.
<For Internet Explorer customers>
You can use Babel-transpiled skyway.js by rewriting your HTML like below.
Notice: Providing Babel-transpiled skyway.js is only this time. When you’ll update version next time, please refer to below FAQ.