Change OS X image to Xcode 8.

luosheng · luosheng · commit 7329b2a7e7a4 · 2016-06-22T15:11:13.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ language: objective-c
  
 xcode_project: OpenSim.xcodeproj
 xcode_scheme: OpenSim
-osx_image: xcode7.3
+osx_image: xcode8
  
 script:
 - xcodebuild clean build -project OpenSim.xcodeproj -scheme OpenSim
