i have a wrong architecture

https://github.com/mapbox/mapbox-directions-swift/blob/be90d21c93c3047ea8f04b5f53d99f3d3e0e159b/Sources/MapboxDirections/Directions.swift#L58

For some reason, i'm getting:
```
/Carthage/Checkouts/MapboxDirections.swift/Sources/MapboxDirections/MBDirections.swift:59:27: error: constant 'chip' used before being initialized
components.append("(\(chip))")
```

So I guess somehow my arch falls out of the branches... what must the arch be?!

Start with Sources/MapboxDirections/Directions.swift at the linked line and compare it with the reported MBDirections.swift line 59 in the Carthage checkout. Reproduce the initialization error and inspect the architecture branches involved; done means identifying the unsupported architecture case or confirming the supported architecture needed.

Written by the indexing model from the issue text.