Support .NET Standard

Author: endeavour

common.targets

@@ -1,16 +1,22 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0</TargetFrameworks>
+    <TargetFrameworks>netstandard1.5;netstandard2.0;net6.0</TargetFrameworks>
     <RootNamespace>nng</RootNamespace>
     <MSBuildTreatWarningsAsErrors>true</MSBuildTreatWarningsAsErrors>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <WarningsAsErrors />
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(TargetFramework)'=='net6.0'">
     <LangVersion>9.0</LangVersion>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(TargetFramework)'!='net6.0'">
+    <LangVersion>7.3</LangVersion>
+  </PropertyGroup>
 
   <PropertyGroup>
-    <VersionPrefix>1.4.1</VersionPrefix>
+    <VersionPrefix>1.4.4</VersionPrefix>
     <VersionSuffix></VersionSuffix>
     <Authors>Jeikabu, James Freiwirth</Authors>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>

nng.NET.Shared/nng.NET.Shared.csproj

@@ -13,4 +13,10 @@
     <PackageOutputPath>../bin/$(Configuration)</PackageOutputPath>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="system.memory" Version="4.5.4" />
+    <PackageReference Include="system.valuetuple" Version="4.5.0" />
+    <PackageReference Include="system.runtime.loader" Version="4.3.0" />
+  </ItemGroup>
+
 </Project>