Update README.md

Author: ivan-betev

Modern Development/Service Portal Widgets/Catalog Item Explorer/README.md

@@ -25,7 +25,7 @@ The primary goal of the Catalog Item Explorer widget is to serve as a valuable l
 8. **Widget Title:** Customize the title of the widget to match its purpose within your Service Portal.
 9. **Copyright Display:** Choose whether to display copyright information in the bottom right corner of the widget.
 
-Latest Update (v1.21):
+## Latest Update (v1.21):
 - **Support for the external URL content items.
 - **The default target window changed to "_self" (same window).
 - **Option to open an item in the new window added at the end of the row.