Update .travis.xml

Try again.
2017-12-27 15:45:11 -08:00 · 2017-12-27 15:45:11 -08:00 · 4eb56b3ae6
parent a530af181a
commit 4eb56b3ae6
1 changed files with 4 additions and 1 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -1,4 +1,7 @@
-osx_image: xcode8.3
+osx_image: xcode9.2
 language: objective-c
 xcode_project: Cog.xcodeproj
 xcode_scheme: Cog
+before_install:
+  - brew update
+  - brew outdated xctool || brew upgrade xctool