Update change_log.md

Author: jmanico

change_log.md

@@ -4,6 +4,8 @@
     * Changes how we avoid problems with special tags inside <select> elements. We recommend using this version over v20211018.1.
   * Release 20211018.1
     * This release fixes a vulnerability as tracked by CVE-2021-42575
+  * Release 20200713.1
+    * Improves SVG and MathML support.
   * Release 20191001.1
     * Package as an OSGI bundle
   * Release 20190610.1