Newtonsoft.Json upgraded to 13.0.1

Author: Usman Liaqat

IPGeolocation/IPGeolocation.nuspec

@@ -11,7 +11,7 @@
     <releaseNotes>First release</releaseNotes>
     <copyright>Copyright 2018 (c) Ipgeolocation Corporation. All rights reserved.</copyright>
     <dependencies>
-    <dependency id="Newtonsoft.Json" version="11.0.2" />
+    <dependency id="Newtonsoft.Json" version="13.0.1" />
 
    </dependencies>
    </metadata>