Update travis.yml to use scope carthage commands

Author: hamchapman

.travis.yml

@@ -37,8 +37,8 @@ install:
   - pod update
   - pod install
 before_deploy:
-  - carthage build --no-skip-current --verbose
-  - carthage archive PusherSwift
+  - carthage build --no-skip-current --project-directory PusherSwift
+  - carthage archive PusherSwift --project-directory PusherSwift
 deploy:
   provider: releases
   api_key: