Demo: Update browser support message.

Author: blueimp

index.html

@@ -123,7 +123,7 @@ <h2>Result</h2>
     </p>
     <figure id="result">
       <figcaption style="display: none;">
-        This demo works only in browsers with support for the
+        Loading images from File objects requires support for the
         <a href="https://developer.mozilla.org/en-US/docs/Web/API/URL">URL</a>
         or
         <a href="https://developer.mozilla.org/en-US/docs/Web/API/FileReader"