Add challenge chest data

[smlbiobot]

Great API. Can you add challenge chest data, e.g. epic / legendary / rare chances for Classic Challenges and Grand Challenges chests together with the gold range, card count, etc?

Thanks!

[martincarrera]

I will try to do that, you are right - we are missing that information.

[HZooly]

Are you working on it, or do you want I check that ?

[martincarrera]

@torzuoliH if you can take a look at it, I will be really happy to receive some help. Let me know if I can help you with anything. Thanks!

[HZooly]

@martincarrera I will take it as soon as possible on your other repository, and make a PR when it will be ok