update change log

Author: dobrown

docs/change_log.html

@@ -27,6 +27,13 @@ <h1>Change Log</h1>
     	</div>
 
 
+	<h2>Version 6.3.1 (released 29 Apr 2025)</h2>
+    <ul>
+      <li>added Stop conditions to Autotracker controls</li>
+      <li>added template width and height fields to Autotracker</li>
+      <li>added rectanglular template shape option to Autotracker</li>
+      <li>added pixel length field to Calibration Stick</li>
+    </ul>
 	<h2>Version 6.3.0 (released 13 Feb 2025)</h2>
     <ul>
       <li>switched bundled Java runtime to OpenJDK</li>