Add messages view link.

whatsnew.htm

@@ -99,7 +99,7 @@ For conditions of distribution and use, see <a href="https://jrsoftware.org/file
 
 <p>Contributions via <a href="https://github.com/jrsoftware/issrc" target="_blank">GitHub</a>: <b>Thanks to Gavin Lambert and leserg73 for their contributions.</b></p>
 
-<p>Some messages have been added and changed in this version: (<a href=" todo ">View differences in Default.isl</a>).</p>
+<p>Some messages have been added and changed in this version: (<a href="https://github.com/jrsoftware/issrc/commit/6ffdcd8a5f73f6614f7973269155e81248fcac64">View differences in Default.isl</a>).</p>
 <ul>
   <li><b>New messages:</b>
   <ul>