Bump Newtonsoft.Json from 9.0.1 to 13.0.1 in /IGWebApiClient

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 9.0.1 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@9.0.1...13.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

IGWebApiClient/packages.config

@@ -3,7 +3,7 @@
   <package id="Microsoft.Bcl" version="1.1.10" targetFramework="portable45-net45+win8+wp8+wpa81" />
   <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="portable-win+net45+wp80+MonoAndroid10+MonoTouch10" />
   <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="portable45-net45+win8+wp8+wpa81" />
-  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="portable45-net45+win8+wp8+wpa81" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="portable45-net45+win8+wp8+wpa81" />
   <package id="PCLCrypto" version="2.0.147" targetFramework="portable45-net45+win8+wp8+wpa81" />
   <package id="Validation" version="2.4.22" targetFramework="portable45-net45+win8+wp8+wpa81" />
 </packages>