Update version in Cocoapods repository to 1.2.0

[fwielstra]

The latest version of RHAddressBook listed in Cocoapods is 1.1.1, which is problematic to use with Swift due to no NS_ENUM being used.

https://github.com/CocoaPods/Specs/tree/master/Specs/RHAddressBook

[rlaferla]

Bump