Update appcast.xml

Author: sbarex

appcast.xml

@@ -17,8 +17,9 @@
                 <p>Bug fix:</p>
                 <ul>
                     <li>Regression fix for rft background color.</li>
+                    <li>Fixed the Sparkle integration bug.</li>
                 </ul>
-                <p><b>If you use the release 2.1.6, the automatic update does not work. Tou have to <a href="https://github.com/sbarex/SourceCodeSyntaxHighlight/releases/download/2.1.8/Syntax.Highlight.zip">manually download the application from the web</a>.</b></p>
+                <p><b>If you use the release 2.1.6 - 2.1.8 (55), the automatic update may not work. You have to <a href="https://github.com/sbarex/SourceCodeSyntaxHighlight/releases/download/2.1.8/Syntax.Highlight.zip">manually download the application from the web</a>.</b></p>
                 <ol>
                     <li>Unzip the archive</li>
                     <li>Replace the app inside the <code>Applications</code> folder</li>
@@ -46,7 +47,7 @@
                 <ul>
                     <li>Better procedure for install the command line tool.</li>
                     <li>Fixed custom css style for global settings.</li>
-                    <li>Fixed the Sparkle integration bug..</li>
+                    <li>Fixed the Sparkle integration bug.</li>
                 </ul>
                 <p><b>If you have installed version 2.1.6 you may need to <a href="https://github.com/sbarex/SourceCodeSyntaxHighlight/releases/download/2.1.7/Syntax.Highlight.zip">re-download the updated app from the web</a>.</b></p>