Travis to Xcode 10 and updated test devices (also removed old iOS simulator start workaround)

Author: rhodgkins

.travis.yml

@@ -1,9 +1,6 @@
 language: objective-c
-osx_image: xcode8
+osx_image: xcode10
 script:
-    # Workaround for Simulator getting stuck
-    # See: https://github.com/travis-ci/travis-ci/issues/3040#issuecomment-146700203
-    - open -b com.apple.iphonesimulator
     - xcodebuild -project Tests/HTTPStatusCodes.xcodeproj -scheme HTTPStatusCodes clean build test
-    - xcodebuild -project Tests/HTTPStatusCodes.xcodeproj -scheme HTTPStatusCodes -destination "platform=iOS Simulator,name=iPhone 7" clean build test
-    - xcodebuild -project Tests/HTTPStatusCodes.xcodeproj -scheme HTTPStatusCodes  -destination "platform=tvOS Simulator,name=Apple TV 1080p" clean build test
+    - xcodebuild -project Tests/HTTPStatusCodes.xcodeproj -scheme HTTPStatusCodes -destination "platform=iOS Simulator,name=iPhone X" clean build test
+    - xcodebuild -project Tests/HTTPStatusCodes.xcodeproj -scheme HTTPStatusCodes -destination "platform=tvOS Simulator,name=Apple TV 4K" clean build test