remove rvm version to fix travis

.travis.yml

@@ -1,23 +1,21 @@
 osx_image: xcode8.3
 language: objective-c
-rvm:
-- 2.2
 env:
   global:
-  - LANG=en_US.UTF-8
-  - secure: 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
+    - LANG=en_US.UTF-8
+    - secure: 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
   matrix:
-  - PLATFORM="iOS"
-  - PLATFORM="tvOS"
-  - PLATFORM="macOS"
+    - PLATFORM="iOS"
+    - PLATFORM="tvOS"
+    - PLATFORM="macOS" 
 cache:
-- bundler
+  - bundler
 before_install:
-- brew update
-- brew upgrade carthage || true
-- carthage version
-- carthage bootstrap --platform $PLATFORM
+  - brew update
+  - brew upgrade carthage || true
+  - carthage version
+  - carthage bootstrap --platform $PLATFORM
 script:
-- bundle exec rake ci[$PLATFORM]
+  - bundle exec rake ci[$PLATFORM]
 after_success:
-- bash <(curl -s https://codecov.io/bash)
+  - bash <(curl -s https://codecov.io/bash)