Bump Newtonsoft.Json from 11.0.2 to 13.0.1 in /Source/MDK (#269)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 11.0.2 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@11.0.2...13.0.1)

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

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Source/MDK/packages.config

@@ -40,7 +40,7 @@
   <package id="Microsoft.VisualStudio.Utilities" version="15.7.27703" targetFramework="net472" />
   <package id="Microsoft.VisualStudio.Validation" version="15.5.31" targetFramework="net472" />
   <package id="Microsoft.Win32.Registry" version="4.6.0" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="11.0.2" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net472" />
   <package id="Ookii.Dialogs.Wpf" version="3.1.0" targetFramework="net472" />
   <package id="Scripty.MsBuild" version="0.7.4" targetFramework="net472" developmentDependency="true" />
   <package id="SQLitePCLRaw.bundle_green" version="1.1.11" targetFramework="net472" />