FIX: File extension error when URL has query parameters

When a URL pattern has a query string the file-extension isn't matched correctly IFF the URL has . in the query parameters.
This fix is from original dom-to-image repo by:
https://github.com/CG-man 
tsayen#285

src/dom-to-image-more.js

@@ -411,7 +411,7 @@
         }
 
         function parseExtension(url) {
-            var match = /\.([^\.\/]*?)$/g.exec(url);
+            var match = /\.([^\.\/]*?)(\?|$)/g.exec(url);
             if (match) return match[1];
             else return '';
         }