Fixed NewtonSoft JSON references to make the demo application work again

Author: KoenZomers

Api/API.csproj

@@ -20,13 +20,13 @@
   <ItemGroup Condition=" '$(TargetFramework)' == 'net452' ">
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Web" />
-    <PackageReference Include="Newtonsoft.Json" Version="8.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="11.0.1" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Web" />
-    <PackageReference Include="Newtonsoft.Json" Version="8.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="11.0.1" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.0' ">

Demo/DemoApplication.csproj

@@ -86,7 +86,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json">
-      <Version>12.0.2</Version>
+      <Version>11.0.1</Version>
     </PackageReference>
   </ItemGroup>
   <ItemGroup>