Merge remote-tracking branch 'origin/master'

Author: Matt Hunt

src/GeoJSON.Net.Tests/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Newtonsoft.Json" version="10.0.2" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net45" />
   <package id="NUnit" version="3.7.0" targetFramework="net461" />
   <package id="NUnit3TestAdapter" version="3.8.0-alpha1" targetFramework="net45" />
 </packages>