Merge branch 'master' into dev

# Conflicts:
#	src/client/Bootstrap.Client/Controllers/ToolsController.cs

README.zh-CN.md

@@ -203,4 +203,4 @@ docker pull reg.qiniu.com/argozhang/ba
 
 如果这个项目对您有所帮助，请扫下方二维码打赏一杯咖啡。    
 
-![WeChat](https://images.gitee.com/uploads/images/2020/0320/201944_4a11eb88_554725.png "微信扫码")
+![WeChat](https://images.gitee.com/uploads/images/2020/0326/184932_91b9baf4_554725.png "微信扫码")

src/client/Bootstrap.Client/Controllers/ToolsController.cs

@@ -1,4 +1,4 @@
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using Bootstrap.Client.Extensions;
 using Bootstrap.Client.Models;
 using Longbow.Data;

src/client/Bootstrap.Client/appsettings.json

@@ -58,14 +58,6 @@
     "To": "argo@163.com",
     "Timeout": 5000
   },
-  "MailClient": {
-    "Host": "smtp.exmail.qq.com",
-    "Port": 587,
-    "EnableSsl": true,
-    "Password": "",
-    "From": "ba-support@dsnixi.com",
-    "To": "argo@163.com"
-  },
   "AllowOrigins": "http://localhost,http://argo.zylweb.cn",
   "LongbowCache": {
     "Enabled": true,