Rssdp.NetStd by Rssdp.NetStd

<PackageReference Include="Rssdp.NetStd" Version="4.0.4" />

 Rssdp.NetStd 4.0.4

Rssp ported to .NET5 without the cruft

<package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
  <metadata>
    <id>Rssdp.NetStd</id>
    <version>4.0.4</version>
    <authors>Rssdp.NetStd</authors>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <license type="expression">MIT</license>
    <licenseUrl>https://licenses.nuget.org/MIT</licenseUrl>
    <projectUrl>https://github.com/captainjono/RSSDP</projectUrl>
    <description>Rssp ported to .NET5 without the cruft</description>
    <releaseNotes>Adds support for NetStd2.0</releaseNotes>
    <dependencies>
      <group targetFramework=".NETStandard2.0" />
      <group targetFramework=".NETStandard2.1" />
    </dependencies>
  </metadata>
</package>