Merge pull request #769 from valeriob/multitarget_netstandard2.0

multitarget netstandard2.0

Author: somdoron

src/NetMQ/NetMQ.csproj

@@ -6,7 +6,7 @@
     <Version>4.0.0.0</Version>
     <PackageVersion>4.0.0.0</PackageVersion>
     <!--monoandroid60;xamarinios10-->
-    <TargetFrameworks>netstandard1.6;net40</TargetFrameworks>
+    <TargetFrameworks>netstandard1.6;netstandard2.0;net40</TargetFrameworks>
     <DebugType>portable</DebugType>
     <AssemblyName>NetMQ</AssemblyName>
     <AssemblyOriginatorKeyFile>./NetMQ.snk</AssemblyOriginatorKeyFile>
@@ -67,6 +67,10 @@
     <PackageReference Include="System.Threading.Thread" Version="4.0.0" />
     <PackageReference Include="System.Net.NetworkInformation" Version="4.1.0" />
   </ItemGroup>
+  
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
+    <PackageReference Include="System.ServiceModel.Primitives" Version="4.4.0" />
+  </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'uap10.0' ">
     <PackageReference Include="System.ServiceModel.Primitives" Version="4.1.0" />