fixup! Fixed warnings

(fixes commit 7891d58)

Author: xperiandri

src/FSharp.Data.GraphQL.Server.Middleware/FSharp.Data.GraphQL.Server.Middleware.fsproj

@@ -18,6 +18,11 @@
     <None Include="..\..\README.md" Pack="true" PackagePath="" Visible="False" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="FSharp.Control.Reactive" />
+    <PackageReference Include="System.Reactive" />
+  </ItemGroup>
+
   <ItemGroup>
     <Compile Include="ObjectListFilter.fs" />
     <Compile Include="TypeSystemExtensions.fs" />