Mollie API 1.4.2
- Removed the RestSharp dependency and now using HttpClient instead.
- Converted the Mollie.API project to a .NET standard 1.2 class library, so it can be used in PCL and .NET core projects as well.
- Added support for the revoke mandate API call.
- Fixed issue with the KbcIssuer enum not being converted to it's proper string representation.