Update and bump version.

whatsnew.htm

@@ -28,10 +28,12 @@ For conditions of distribution and use, see <a href="https://jrsoftware.org/file
 
 <p><b>Want to be notified by e-mail of updates?</b> Then <a href="https://jrsoftware.org/ismail.php">click here to subscribe</a> to the Inno Setup announcements mailing list.<br /><b>If you subscribed before October 2019, please resubscribe.</b></p>
 
-<p><a name="6.0.5"></a><span class="ver">6.0.5-dev </span><span class="date">(?)</span></p>
+<p><a name="6.0.5"></a><span class="ver">6.0.5 </span><span class="date">(2020-05-21)</span></p>
 <ul>
   <li>Changes to further help protect installers against potential DLL preloading attacks.</li>
   <li>Compiler IDE change: added <a href="https://jrsoftware.org/ismail.php">Inno Setup Mailing List</a> menu item to the Help menu.</li>
+  <li>Inno Setup can now be installed using the new <a href="https://github.com/microsoft/winget-cli">Windows Package Manager</a>.</li>
+  <li>Minor tweaks.</li>
 </ul>
 
 <p><a name="6.0.4"></a><span class="ver">6.0.4 </span><span class="date">(2020-03-12)</span></p>