Update os_image to 9

wongzigii · wongzigii · commit ea756b52185a · 2017-09-28T21:18:17.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode8
+osx_image: xcode9
 xcode_sdk: iphonesimulator10.0
 env:
   - PLATFORM="ios" SCHEME="AlamofireSwiftyJSON" DESTINATION="platform=iOS Simulator,name=iPhone SE,OS=10.0"
