Update release note

Yukaii · Yukaii · commit fefe7d8e6945 · 2021-01-04T17:21:01.000+08:00
Signed-off-by: Yukai Huang &lt;yukaihuangtw@gmail.com&gt;
diff --git a/public/docs/release-notes.md b/public/docs/release-notes.md
@@ -1,6 +1,13 @@
 Release Notes
 ===
 
+<i class="fa fa-tag"></i> 2.3.1 Isoetes taiwanensis <i class="fa fa-clock-o"></i> 2021-01-04
+---
+
+### Fixes
+
+* Upgrade mermaid to 8.6.4 to make the previous fix works
+
 <i class="fa fa-tag"></i> 2.3.0 Isoetes taiwanensis <i class="fa fa-clock-o"></i> 2020-12-30
 ---
 
