BinanceApiCallback must have an onFailure() method

[antoinebaudoux]

The BinanceApiAsyncRestClient is useless if the caller of the async method isn't notified in case of error.

The BinanceApiCallback interface must have an onFailure() method so that the caller can be notified of errors.

[joaopsilva]

Hi @ab-taktik, there's a pull request in #49, which exposes the onFailure method, I will be reviewing it this week and merging it to master. Stay tuned.

[fromjgor]

Hi @joaopsilvto , great! will be there some example like a cookbook how to implement the error handling properly? Maybe you could also recap the last changes (e.g. related to your recommendation to use singletons instead of creating API instance).
Thanks, @fromjgor

[joaopsilva]

Hi @ab-taktik , this is now implemented, please update your repository.

[antoinebaudoux]

@joaopsilva Thank you for the feedback! I'll update