Added Brazilian Cards(Elo, Hipercard and Aura)

[andre991]

The PR should summarize what was changed and why. Here are some questions to help you if you're not sure:

• What behavior was changed? Added Brazilian Cards, Converted to Swift 4.2
• What code was refactored / updated to support this change? SwiftLuhn.swift added Elo, Hipercard and Aura
• What issues are related to this PR? Or why was this change introduced?

Checklist - While not every PR needs it, new features should consider this list:

• [x] Does this have tests?
• [x] Does this have documentation?
• [ ] Does this break the public API (Requires major version bump)?
• [x] Is this a new feature (Requires minor version bump)?

[p16r]

HI. Thank you for this library. It's been incredibly useful for my app so far. Any update on when 1.1.0 will be released following fix for #16?