Bump TravisCI image to Xcode 7.2

tonyarnold · tonyarnold · commit 1aec418da4a6 · 2016-01-21T21:12:20.000+11:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,3 @@
 language: objective-c
+osx_image: xcode7.2
 script: Support/Scripts/objc-build-scripts/cibuild
-osx_image: xcode7.1
