Bump Newtonsoft.Json in /aspnet-samples/ChatRoomLocal (#192)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 6.0.4 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/6.0.4...13.0.1)

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

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aspnet-samples/ChatRoomLocal/packages.config

@@ -11,6 +11,6 @@
   <package id="Microsoft.Owin.Host.SystemWeb" version="2.1.0" targetFramework="net461" />
   <package id="Microsoft.Owin.Security" version="2.1.0" targetFramework="net461" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net461" />
-  <package id="Newtonsoft.Json" version="6.0.4" targetFramework="net461" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net461" />
   <package id="Owin" version="1.0" targetFramework="net461" />
 </packages>