Bump Newtonsoft.Json from 10.0.1 to 13.0.1 in /DatatableJS (#79)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 10.0.1 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@10.0.1...13.0.1)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

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DatatableJS/DatatableJS.csproj

@@ -23,7 +23,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Mvc.ViewFeatures" Version="2.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.Razor" Version="2.1.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="4.4.0" />
   </ItemGroup>