Upgrade travis

Author: pera

.travis.yml

@@ -1,7 +1,7 @@
 language: objective-c
-osx_image: xcode8
+osx_image: xcode8.3
 env:
-  - DESTINATION="OS=10.0,name=iPhone 6s" SCHEME="XLPagerTabStrip" SDK=iphonesimulator10.0
+  - DESTINATION="OS=10.3,name=iPhone 6s" SCHEME="XLPagerTabStrip" SDK=iphonesimulator10.3
 before_install:
 - brew update
 #- brew outdated carthage || brew upgrade carthage