4.0.0

• This library no longer targets .NET 4.6.1.
• .NET 6.0 was added as a target.
• Removed deprecated code, include:
  • The class MaxMind.MinFraud.Response.GeoIP2Country was removed. This was
    a subclass of MaxMind.GeoIP2.Model.Country that added an IsHighRisk
    property. This property was marked obsolete in 2019. Now
    MaxMind.GeoIP2.Model.Country is used directly.
  • In MaxMind.MinFraud.Response.Subscores, the properties EmailTenure
    and IPTenure were removed. These were deprecated in the web service
    and always return a fixed value.