Merge branch 'develop' into 'stable-v2'

更新index.json

See merge request codechina/programmer/programer_magazine_list!9

index.json

 {
     "magazines": [
+        {
+            "id": "3",
+            "title": "《 云原生和全面数字化实践 》",
+            "sub_title": "《新程序员》第三期",
+            "path": "new-programmer/2021-03",
+            "ref": "master",
+            "detail": "detail.json",
+            "chapters": "chapters.json",
+            "index_image": "https://img-blog.csdnimg.cn/eb18ac524e704f50af3750417360d299.png",
+            "index_video": "",
+            "original_price": "48.0",
+            "line_price": "48.0",
+            "sale_price": "48.0",
+            "short_description": "",
+            "description": "",
+            "author": {
+                "username": "programmer",
+                "user_title": "国内开发者的权威刊物",
+                "nickname": "程序员杂志编辑组"
+            }
+        },
         {
             "id": "2",
             "title": "《 新数据库时代&软件定义汽车 》",