Use Xcod 10 in Travis

Author: devxoul

.travis.yml

@@ -1,14 +1,14 @@
-osx_image: xcode9
+osx_image: xcode10
 language: objective-c
 sudo: required
 env:
   global:
     - PROJECT="AlertReactor.xcodeproj"
     - SCHEME="AlertReactor-Package"
-    - IOS_SDK="iphonesimulator11.0"
+    - IOS_SDK="iphonesimulator12.0"
     - FRAMEWORK="AlertReactor"
   matrix:
-    - SDK="$IOS_SDK"    DESTINATION="platform=iOS Simulator,name=iPhone 8,OS=11.0"
+    - SDK="$IOS_SDK"    DESTINATION="platform=iOS Simulator,name=iPhone 8,OS=12.0"
 
 install:
   - eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)"