Merge pull request #48 from layoutBox/upgrade_xcode_9.2

Upgrade TravisCI to xcode 9.2

Author: lucdion

.travis.yml

@@ -1,11 +1,11 @@
 language: objective-c
-osx_image: xcode9
+osx_image: xcode9.2 
 
 env:
   matrix:
-    - SCHEME=FlexLayout       SDK=iphonesimulator11.0
+    - SCHEME=FlexLayout       SDK=iphonesimulator11.2
     - SCHEME=FlexLayout       SDK=iphonesimulator10.3
-    - SCHEME=FlexLayoutSample SDK=iphonesimulator11.0
+    - SCHEME=FlexLayoutSample SDK=iphonesimulator11.2
 
 before_install:
   - rvm use $RVM_RUBY_VERSION