restored framework version threading extensions

Author: jirkapok

Source/Terminals/Terminals.csproj

@@ -28,7 +28,7 @@
 
 	  <!-- Hack https://github.com/dotnet/sdk/issues/1791 to enforce nestandard version -->
 	  <Reference Include="System.Threading.Tasks.Extensions">
-		  <HintPath>$(PkgSystem_Threading_Tasks_Extensions)\lib\net462\System.Threading.Tasks.Extensions.dll</HintPath>
+		  <HintPath>$(PkgSystem_Threading_Tasks_Extensions)\lib\netstandard2.0\System.Threading.Tasks.Extensions.dll</HintPath>
 	  </Reference>
 
 	  <Reference Include="AWSSDK, Version=1.3.10.0, Culture=neutral, PublicKeyToken=cd2d24cd2bace800, processorArchitecture=MSIL">

Source/Tests/Tests.csproj

@@ -21,7 +21,7 @@
 	  <PackageReference Include="System.Threading.Tasks.Extensions" GeneratePathProperty="true" ExcludeAssets="Compile;Runtime;Build" />
 	  <!-- Hack https://github.com/dotnet/sdk/issues/1791 to enforce nestandard version -->
 	  <Reference Include="System.Threading.Tasks.Extensions">
-		  <HintPath>$(PkgSystem_Threading_Tasks_Extensions)\lib\net462\System.Threading.Tasks.Extensions.dll</HintPath>
+		  <HintPath>$(PkgSystem_Threading_Tasks_Extensions)\lib\netstandard2.0\System.Threading.Tasks.Extensions.dll</HintPath>
 		  <SpecificVersion>False</SpecificVersion>
 	  </Reference>