Bump Newtonsoft.Json in /Demos/src/GroupDocs.Assembly.Live.Demos.UI

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 12.0.2 to 13.0.2.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@12.0.2...13.0.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Demos/src/GroupDocs.Assembly.Live.Demos.UI/packages.config

@@ -34,7 +34,7 @@
   <package id="Microsoft.NETCore.Portable.Compatibility" version="1.0.1" targetFramework="net471" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net451" />
   <package id="Modernizr" version="2.8.3" targetFramework="net471" />
-  <package id="Newtonsoft.Json" version="12.0.2" targetFramework="net471" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net471" />
   <package id="Npgsql" version="4.1.1" targetFramework="net471" />
   <package id="popper.js" version="1.14.3" targetFramework="net471" />
   <package id="Respond" version="1.4.2" targetFramework="net471" />