Update changelog

documentation/changelog.html

@@ -851,6 +851,7 @@
 
     <h3>Stylesheets and theming</h3>
     <ul aria-role="log" aria-live="off">
+        <li>[2017-12-13] (<a href="https://github.com/chamilo/chamilo-lms/commit/de79a59f46e2de4ecf81b9782532f4bef092bd27">de79a59f</a>) Template: Change course code for the course id to use in Twig variable</li>
         <li>[2017-08-07] (<a href="https://github.com/chamilo/chamilo-lms/commit/b092665a78e8ee82757b51f03ab496ea0aac569a">b092665a</a> - <a href="https://task.beeznest.com/issues/13169">BT#13169</a>) Template: Add _p.web_url variable in twig template</li>
         <li>[2017-06-16] (<a href="https://github.com/chamilo/chamilo-lms/commit/686274be02c1ed3027ed0b7a76b2f6e12cc800cd">686274be</a> - <a href="https://task.beeznest.com/issues/12926">BT#12926</a>) Template: Improving and create tpl for forum view</li>
         <li>Additional templates in main/template/ will now work as override: you don't need to copy the full default/ folder anymore, just create the .tpl you need to change and its dependencies (see "extend" statements in some .tpl)</li>