Updates Xcode version in travis build file.

tigerpixel · tigerpixel · commit 8dd25adefe91 · 2017-09-30T00:29:13.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,4 @@
-osx_image: xcode8.3
+osx_image: xcode9
 language: objective-c
 
 before_install:
