move carthage update to before_install

Author: nuclearace

.travis.yml

@@ -8,10 +8,10 @@ branches:
     - development
 before_install:
   - brew update
-  - brew outdated xctool || brew upgrade xctool
+  # - brew outdated xctool || brew upgrade xctool
   - brew outdated carthage || brew upgrade carthage
-script:
   - carthage update
+script:
   - xcodebuild -project Socket.IO-Client-Swift.xcodeproj -scheme SocketIO-Mac build test -quiet
 #  - xcodebuild -project Socket.IO-Client-Swift.xcodeproj -scheme SocketIO-Mac build-for-testing -quiet
 #  - xctool -project Socket.IO-Client-Swift.xcodeproj -scheme SocketIO-Mac run-tests --parallelize