v3.1.0
Converted to .NET Standard 2.0 (compatible with .NET framework 4.6.1+ as well as .NET Core 2.0+)
Added rate limiter
All properties converted to nullable to fix unexpected changes on update requests
Migrated from XML to JSON communication
Fixed some string properties to actual data-type
Added more tests
Fixed various minor issues
General solution clean-up
Updated NuGet is now available in NuGet Gallery - https://www.nuget.org/packages/Fortnox.NET.SDK/3.1.0