update travis xcode version

PiXeL16 · PiXeL16 · commit 8ad79d7bfb70 · 2016-09-19T16:00:28.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode7.3
+osx_image: xcode8
 env:
   global:
   - LC_CTYPE=en_US.UTF-8
