Set ios deployment target to ios 12

Findprovs adds count.

Simplify add arg to single path - changes api

Reduce use of stringly typed lookups. Fix boundary bug.

Merge branch 'master' of https://github.com/ipfs/swift-ipfs-api

License: MIT
Signed-off-by: Teo Sartori <[email protected]>

Keep up Carthage!

Swift 3

Multiplatform

Update readme for using JsonType.

Add JsonType to allow any valid Json as return value. Add last tests.