Per signalapp/Signal-iOS#2341 we've moved the SignalServiceKit codebase into the primary Signal-iOS repository at https://github.com/WhisperSystems/Signal-iOS. As such, this repository will no longer be updated.
Don't worry - we will continue to make updates to SignalServiceKit, and you can continue to use it in your projects as before. The only difference is where the code lives.
If you are using Cocoapods, staying up to date is as simple as modifying a line in your Podfile from this:
- pod 'SignalServiceKit', git: 'https://github.com/WhisperSystems/SignalServiceKit.git'
To this:
+ pod 'SignalServiceKit', git: 'https://github.com/WhisperSystems/Signal-iOS.git'
SignalServiceKit is an Objective-C library for communicating with the Signal messaging service for iOS & OS X