Travis sneakily replaced the Xcode 8.3 image.

jberkel · jberkel · commit 2b067d4ee162 · 2017-06-16T07:45:08.000+02:00
https://blog.travis-ci.com/2017-06-06-xcode-833-is-here
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,7 @@ osx_image: xcode8.3
 env:
   global:
     - IOS_SIMULATOR="iPhone 6s"
+    - IOS_VERSION="10.3.1"
 matrix:
   include:
     - env: BUILD_SCHEME="SQLite iOS"
