Fix macOS desktop file.

Author: michaelrsweet

desktop/htmldoc.plist.in

@@ -17,7 +17,7 @@
 	<string>English</string>
 
 	<key>NSHumanReadableCopyright</key>
-	<string>Copyright 1997-2019 by Michael R Sweet</string>
+	<string>Copyright 1997-2024 by Michael R Sweet</string>
 
 	<key>CFAppleHelpAnchor</key>
 	<string>help</string>
@@ -38,7 +38,7 @@
 	<string>@SVERSION@</string>
 
 	<key>CFBundleGetInfoString</key>
-	<string>@SVERSION@, Copyright Michael R Sweet 1997-2019</string>
+	<string>@SVERSION@, Copyright Michael R Sweet 1997-2024</string>
 
 	<key>CFBundleDocumentTypes</key>
 	<array>