添加.net4.0编译版本

README.md

@@ -17,3 +17,5 @@ curl -O https://y-bi.top/setup.sh && sudo chmod +x setup.sh && ./setup.sh
 ### Windows
 
 Download setup file: [https://y-bi.top/setup.exe](https://y-bi.top/setup.exe)
+
+注意：默认版本兼容.NET2.0+，如果您的操作系统较新（例如 Windows Server 2019，默认没有安装.NET Framework 3.5），可以尝试安装此版本(基于.NET Framework 4构建)：[https://y-bi.top/setup.net4.exe](https://y-bi.top/setup.net4.exe)

setup/app.config

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>

setup/setup.csproj

@@ -8,10 +8,11 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>setup</RootNamespace>
     <AssemblyName>setup</AssemblyName>
-    <TargetFrameworkVersion>v2.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <Deterministic>true</Deterministic>
     <IsWebBootstrapper>false</IsWebBootstrapper>
+    <TargetFrameworkProfile />
     <PublishUrl>publish\</PublishUrl>
     <Install>true</Install>
     <InstallFrom>Disk</InstallFrom>
@@ -67,6 +68,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="app.config" />
     <None Include="Properties\app.manifest" />
   </ItemGroup>
   <ItemGroup>