Try to pull in the correct assemblies for System.Web.HttpUtility.ParseQueryString

Author: rassilon

test/RestSharp.Tests/RestSharp.Tests.csproj

@@ -7,13 +7,10 @@
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\RestSharp\RestSharp.csproj" />
   </ItemGroup>
-  <ItemGroup>
-    <Reference Include="System.Net">
-      <HintPath>..\..\..\..\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Net.dll</HintPath>
-    </Reference>
-    <Reference Include="System.Web">
-      <HintPath>..\..\..\..\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Web.dll</HintPath>
-    </Reference>
+  <ItemGroup Condition="'$(TargetFramework)' == 'net471'">
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Web" />
+    <PackageReference Include="Nullable" Version="1.3.1" PrivateAssets="All" />
   </ItemGroup>
   <ItemGroup>
     <None Update="SampleData\4sq.json" CopyToOutputDirectory="PreserveNewest" />