v0.4.1 - update infura endpoints

• updated the embedded JsonRPC URLs to the new format since the old ones are being discontinued.
  Developers are encouraged to use their own project number or their own RPC url to avoid unexpected connectivity loss.

v0.4.0 - Carthage

• adopted carthage as a new system for delivery.

v0.3.0 - encryption and JWT checks

• added Encryption functionality (see spec)
• added JWT verification (see spec)

0.2.0 - Universal DID Resolver

• Add universal DID resolver
• Renaming of some APIs
• Code cleanup