update html2canvas cors -- allow taint

src/js/08-capture.js

@@ -22,6 +22,7 @@
       scrollX: 0, // reset scrollX for canvas capturing
       scrollY: 0, // reset scrollY for canvas capturing
       scale: 1.3,
+      allowTaint: true,
       useCORS: true,
     }).then(canvas => {
       screenshotImg.src = canvas.toDataURL()