.travis.yml in simctl-1.5.2 vs .travis.yml in simctl-1.5.3

@@ -1,10 +1,20 @@
 language: objective-c
-osx_image: xcode7.3
+matrix:
+  include:
+    - os: osx
+      osx_image: xcode7.3
+      env: CUSTOM_DEVICE_SET_PATH=true
+    - os: osx
+      osx_image: xcode7.3
+      env: CUSTOM_DEVICE_SET_PATH=false
+    - os: osx
+      osx_image: xcode8
+      env: CUSTOM_DEVICE_SET_PATH=true
+    - os: osx
+      osx_image: xcode8
+      env: CUSTOM_DEVICE_SET_PATH=false
 before_script:
   - export LANG=en_US.UTF-8
 install: bundle
-env:
-  - CUSTOM_DEVICE_SET_PATH=true
-  - CUSTOM_DEVICE_SET_PATH=false
 script:
   - bundle exec rake