fixed cors image issue

Author: ivmarcos

src/ReactToPdf.jsx

@@ -19,7 +19,7 @@ class ReactToPdf extends PureComponent {
         'Target ref must be used or informed. See https://github.com/ivmarcos/react-to-pdf#usage.'
       );
     }
-    html2canvas(targetComponent, { logging: false }).then(canvas => {
+    html2canvas(targetComponent, { logging: false, useCORS: true }).then(canvas => {
       const imgData = canvas.toDataURL('image/png');
       const pdf = new JsPdf(options);
       pdf.addImage(imgData, 'JPEG', x, y);

src/ReactToPdf.md

@@ -50,3 +50,25 @@ const options = {
     <div style={{width: 500, height: 500, background: 'blue'}} ref={ref}/>
 </div>
 ```
+
+**Cors***
+```jsx
+const ref = React.createRef();
+<div>
+    <ReactToPdf targetRef={ref} filename="div-cors.pdf" >
+        {({toPdf}) => (
+            <button onClick={toPdf}>Generate pdf</button>
+        )}
+    </ReactToPdf>
+    <div ref={ref}>
+        <img
+            src="https://s.ftcdn.net/v2013/pics/all/curated/RKyaEDwp8J7JKeZWQPuOVWvkUjGQfpCx_cover_580.jpg?r=1a0fc22192d0c808b8bb2b9bcfbf4a45b1793687"
+            className={""}
+            alt=""
+            crossOrigin="anonymous"
+        />
+    </div>
+</div>
+```
+
+