Update .travis.yml

.travis.yml

@@ -2,6 +2,7 @@
 language: objective-c
 
 before_script:
+  - gem install cocoapods
   - sudo easy_install cpp-coveralls
 
 script:
@@ -9,4 +10,4 @@ script:
   - xctool -workspace 'Masonry.xcworkspace' -scheme 'Masonry Mac' -configuration Debug -sdk macosx10.7 clean build test
 
 after_success:
-  - ./script/coveralls.sh
+  - ./script/coveralls.sh