Update appcast.xml

Author: sbarex

appcast.xml

@@ -3,6 +3,39 @@
     <channel>
         <title>Syntax Highlight</title>
 
+        <item>
+            <title>2.1.21</title>
+            <pubDate>lun, 19 feb 2024 16:37:00 +0100</pubDate>
+            <sparkle:minimumSystemVersion>10.15</sparkle:minimumSystemVersion>
+            <enclosure 
+                       type="application/octet-stream" 
+                       url="https://github.com/sbarex/SourceCodeSyntaxHighlight/releases/download/2.1.21/Syntax.Highlight.zip" 
+                       sparkle:shortVersionString="2.1.21" sparkle:version="70" 
+                       sparkle:edSignature="DSw3z6jc9b89V9E7lY5fmNoefqY0J6HMSPty9cXOf9sdZ8GiwGoTnphJ//jgirJa4bYzpmNEOihaKH62Na8MAQ==" length="12787024"
+            />
+            <description><![CDATA[
+                <h2>Release 2.1.21 (70)</h2>
+                <p>New features:</p>
+                <ul>
+                    <li>Update Highlight to release 4.10.</li>
+                    <li>Update Dos2Unix to release 7.5.2.</li>
+                    <li>Support for Steam app manifest files (<code>.acf</code>) files <i>as JSON</i>.</li>
+                    <li>Support for for Lilypond files (<code>.ly</code>).</li>
+                    <li>Experimental support for Astro files (<code>.astro</code>) <i>as JSX</i>.</li>
+                </ul>
+                <p>Bug fix:</p>
+                <ul>
+                    <li>Better support for bazel files.</li>
+                    <li>Fixed <code>cmake</code> support.</li>
+                    <li>Fixed support for <code>lua</code> files.</li>
+                    <li>Fixed support for <code>md</code> files.</li>      
+                    <li>Extended support for Terraform files to the extension <code>.hcl</code> (<i>as YAML</i>).</li>
+                </ul>
+                <p><a href="https://github.com/sbarex/SourceCodeSyntaxHighlight/blob/master/CHANGELOG.md">See the complete changelog.</a></p>
+            ]]>
+            </description>
+        </item>
+        
         <item>
             <title>2.1.20</title>
             <pubDate>mer, 27 set 2023 21:35:00 +0100</pubDate>