Update news.html

Author: Astro-Kirsty

news.html

@@ -120,6 +120,11 @@ <h1 id="releases"><a href="#releases">Releases</a></h1>
         </p>
         <!-- tag news -->
         <ul>
+            <li>
+                <em>November 26, 2024</em> - Gammapy <strong>1.3</strong>
+                    (<a href="https://docs.gammapy.org/1.3/">documentation</a> ,
+                    <a href="https://docs.gammapy.org/1.3/release-notes/v1.3.html">changelog</a>)
+            </li>		
             <li>
                 <em>February 29, 2024</em> - Gammapy <strong>1.2</strong>
                     (<a href="https://docs.gammapy.org/1.2/">documentation</a> ,