Updated project file references

Author: HadenSmith

Numerics/Numerics.csproj

@@ -43,19 +43,20 @@
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Numerics" />
     <Reference Include="System.Runtime.Serialization" />
-    <Reference Include="System.Text.Encodings.Web, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
-      <HintPath>..\..\8.0\packages\System.Text.Encodings.Web.8.0.0\lib\net462\System.Text.Encodings.Web.dll</HintPath>
-    </Reference>
-    <Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
-      <HintPath>..\..\8.0\packages\System.Threading.Tasks.Extensions.4.5.4\lib\net461\System.Threading.Tasks.Extensions.dll</HintPath>
-    </Reference>
-    <Reference Include="System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
-      <HintPath>..\..\8.0\packages\System.ValueTuple.4.5.0\lib\net47\System.ValueTuple.dll</HintPath>
-    </Reference>
-    <Reference Include="System.Xml" />
+	<Reference Include="System.Xml" />
     <Reference Include="System.Xml.Linq" />
+    <PackageReference Include="System.Text.Encodings.Web" Version="8.0.0" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
+    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetFramework)' == 'net481'">
+  <PackageReference Include="System.Text.Encodings.Web" Version="8.0.0" />
+  <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
+  <PackageReference Include="System.ValueTuple" Version="4.5.0" />
+</ItemGroup>
+
+  
   <ItemGroup>
     <None Remove="new-joe-kuo-6.21201" />
     <None Remove="Properties\new-joe-kuo-6.21201" />