Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Extensions/AddressBook/README.markdown

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+# PromiseKit AddressBook Extensions ![Build Status]
+
+This project adds promises to Apple’s AddressBook framework.
+
+## CococaPods
+
+```ruby
+pod "PromiseKit/AddressBook" ~> 6.0
+```
+
+The extensions are built into `PromiseKit.framework` thus nothing else is needed.
+
+## Carthage
+
+```ruby
+github "PromiseKit/AddressBook" ~> 3.0
+```
+
+The extensions are built into their own framework:
+
+```swift
+// swift
+import PromiseKit
+import PMKAddressBook
+```
+
+```objc
+// objc
+@import PromiseKit;
+@import PMKAddressBook;
+```
+
+
+[Build Status]: https://travis-ci.org/PromiseKit/AddressBook.svg?branch=master