adding support of System.Text.Json serialization #2

Author: salaros

src/CodeCave.Threejs.Entities.csproj

@@ -22,12 +22,7 @@
  <ItemGroup>
  <PackageReference Include="JsonSubTypes" Version="1.7.0" />
  <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
- </ItemGroup>
-
- <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
- <PackageReference Include="System.Text.Json">
- <Version>4.7.1</Version>
- </PackageReference>
+ <PackageReference Include="System.Text.Json" Version="4.7.1" Condition="'$(TargetFramework)' != 'net45'" />
  </ItemGroup>
 
 </Project>