Update Travis Config (material-components#1094)

.travis.yml

@@ -1,18 +1,16 @@
 language: objective-c
-osx_image: xcode8.1
+osx_image: xcode8.2
 sudo: false
 # Only fire off builds for specific branches.
 branches:
   only:
-    - develop
-    - stable
+    - testtravis
 env:
   global:
   - LC_CTYPE=en_US.UTF-8
   - LANG=en_US.UTF-8
   matrix:
     - DESTINATION="OS=9.3,name=iPhone 6s" SDK=iphonesimulator9.3
-    - DESTINATION="OS=8.1,name=iPhone 4S" SDK=iphonesimulator9.3
 before_install:
   - gem install xcpretty --no-rdoc --no-ri --no-document --quiet
 script:
@@ -22,5 +20,3 @@ script:
   - scripts/release/manage_pods.py install
   - scripts/build_all
   - scripts/test_all
-after_success:
-  - bash <(curl -s https://codecov.io/bash)