resolve backward compatibility issues

Signed-off-by: Beichi-CHs <g841734459@126.com>

docs/data.json

@@ -1,5 +1,14 @@
 {
   "update": [
+    {
+      "version": "2021-11-20",
+      "level": "Important",
+      "title": "2021-11-20",
+      "details": [
+        "django2.x即将停止支持，更新django到3.x LTS，相应地更新了全部相关依赖",
+        "合并底包版本到python3.8-alpine3.14，为移除python2做准备"
+      ]
+    },
     {
       "version": "2021-09-28",
       "level": "Recommend",