Update DOMPurify to version 1.0.4

openpgp_zimbra_secure/js/DOMPurify/README.md

@@ -4,7 +4,7 @@
 
 DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG.
 
-It's also very simple to use and get started with. DOMPurify was [started in February 2014](https://github.com/cure53/DOMPurify/commit/a630922616927373485e0e787ab19e73e3691b2b) and, meanwhile, has reached version 1.0.3!
+It's also very simple to use and get started with. DOMPurify was [started in February 2014](https://github.com/cure53/DOMPurify/commit/a630922616927373485e0e787ab19e73e3691b2b) and, meanwhile, has reached version 1.0.4!
 
 DOMPurify is written in JavaScript and works in all modern browsers (Safari, Opera (15+), Internet Explorer (10+), Edge, Firefox and Chrome - as well as almost anything else using Blink or WebKit). It doesn't break on MSIE6 or other legacy browsers. It either uses [a fall-back](#what-about-older-browsers-like-msie8) or simply does nothing.
 
@@ -55,7 +55,7 @@ DOMPurify also works server-side with node.js as well as client-side via [Browse
 ```bash
 npm install dompurify
 ```
-
+For JSDOM v10 or newer
 ```javascript
 const createDOMPurify = require('dompurify');
 const { JSDOM } = require('jsdom');
@@ -66,6 +66,17 @@ const DOMPurify = createDOMPurify(window);
 const clean = DOMPurify.sanitize(dirty);
 ```
 
+For JSDOM versions older than v10
+```javascript
+const createDOMPurify = require('dompurify');
+const jsdom = require('jsdom').jsdom;
+
+const window = jsdom('').defaultView;
+const DOMPurify = createDOMPurify(window);
+
+const clean = DOMPurify.sanitize(dirty);
+```
+
 ## Is there a demo?
 
 Of course there is a demo! [Play with DOMPurify](https://cure53.de/purify)