Merge tag 'v2.4.9' into develop

v2.4.9

1. 增加大纲列表脑图展示功能

README.md

@@ -147,7 +147,7 @@ yarn run start
 ## 更新日志
 [最新发布](https://github.com/purocean/yn/releases)
 
-### [v2.4.8](https://github.com/purocean/yn/releases/tag/v2.4.8) 2020-12-15
+### [v2.4.9](https://github.com/purocean/yn/releases/tag/v2.4.9) 2020-12-15
 1. 增加大纲列表脑图展示功能
 
 <details>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yank.note.yang",
-  "version": "2.4.8",
+  "version": "2.4.9",
   "description": "Yank Note 一款面向程序员的 Markdown 笔记应用",
   "main": "dist/app.js",
   "license": "Apache-2.0",