fix: Missing System.Net.WebSockets.Client.Managed.dll

[skip ci]

Author: doghappy

src/SocketIOClient.Windows7/SocketIOClient.Windows7.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>2.2.4.1</Version>
+    <Version>2.2.4.2-alpha.1</Version>
     <Description>socket.io-client implemention for .NET</Description>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/doghappy/socket.io-client-csharp</PackageProjectUrl>
@@ -14,6 +14,10 @@
     <AssemblyOriginatorKeyFile>SocketIOClient.Windows7.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Remove="lib\System.Net.WebSockets.Client.Managed.dll" />
+  </ItemGroup>
+
   <ItemGroup>
     <Compile Include="..\SocketIOClient\BelowNormalEvent.cs" Link="BelowNormalEvent.cs" />
     <Compile Include="..\SocketIOClient\ConnectInterval\DefaultConnectInterval.cs" Link="ConnectInterval\DefaultConnectInterval.cs" />
@@ -56,6 +60,14 @@
     <Compile Include="..\SocketIOClient\WebSocketClient\IWebSocketClient.cs" Link="WebSocketClient\IWebSocketClient.cs" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Content Include="lib\System.Net.WebSockets.Client.Managed.dll">
+      <Pack>true</Pack>
+      <PackagePath>lib\$(TargetFramework)</PackagePath>
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+
   <ItemGroup>
     <Folder Include="ConnectInterval\" />
     <Folder Include="EioHandler\" />
@@ -72,7 +84,7 @@
 
   <ItemGroup>
     <Reference Include="System.Net.WebSockets.Client.Managed">
-      <HintPath>lib\System.Net.WebSockets.Client.Managed.dll</HintPath>
+      <HintPath>System.Net.WebSockets.Client.Managed.dll</HintPath>
     </Reference>
   </ItemGroup>