Upgrade project/package

[ChiefWiggum]

We are currently looking into using ChargeBee for our subscription business, but the lack of maintenance of this package does not really fill us with confidence. Looking at the commits I can see that changes to the api are taken care off, but the rest of the project lacks proper maintance. Issues get more or less ignored by the team, a 12months old pull request never got any feedback, the whole thing obviously was hacked together 2013 and since then never really got a proper update.

Whats happening? It's 2018, please spend some effort and interact with the community! We are all interested in your product, why are you not helping us out? Have a look at the forks from
dexgrid and christianscheuer for a start and merge does changes.

Please invest just a littlebit of your newly raised capital and update the project to a dotnet core solution which follows the 2018 patterns. Especially when it comes to the following points:

• DI
• HttpClient lifecycle with IHttpClientFactory
• Retry policies with Polly
• Config
• Async
• Json.Net serialization/deserialization

Cheers!