Update useCORS documentation (Fix #1323)

src/Clone.js

@@ -182,6 +182,7 @@ export class DocumentCloner {
                             removeContainer: this.options.removeContainer,
                             scale: this.options.scale,
                             foreignObjectRendering: this.options.foreignObjectRendering,
+                            useCORS: this.options.useCORS,
                             target: new CanvasRenderer(),
                             width,
                             height,

src/index.js

@@ -20,6 +20,7 @@ export type Options = {
     removeContainer: ?boolean,
     scale: number,
     target: RenderTarget<*>,
+    useCORS: boolean,
     width: number,
     height: number,
     x: number,
@@ -72,6 +73,7 @@ const html2canvas = (element: HTMLElement, conf: ?Options): Promise<*> => {
         foreignObjectRendering: false,
         scale: defaultView.devicePixelRatio || 1,
         target: new CanvasRenderer(config.canvas),
+        useCORS: false,
         x: left,
         y: top,
         width: Math.ceil(width),