Update Carthage

ios
osx
carthage

#1

Hi,

Carthage has had a couple of releases since the last OSX Image - when will the OSX image be updated please?


#2

We don’t have an ETA, but we will make an announcement here: https://discuss.circleci.com/c/announcements once we update the image.


Announcing Xcode 8.3 support and opt-in upgrades for macOS
#3