Update osx_image to xcode9

.travis.yml

@@ -1,6 +1,36 @@
 language: objective-c
-osx_image: xcode8
+osx_image: xcode9
+branches:
+  only:
+    - master
+env:
+  global:
+  - LC_CTYPE=en_US.UTF-8
+  - LANG=en_US.UTF-8
+  - PROJECT=LeanCloud.xcodeproj
+  - IOS_FRAMEWORK_SCHEME="LeanCloud"
+  matrix:
+    - DESTINATION="OS=11.0,name=iPhone X"          SCHEME="$IOS_FRAMEWORK_SCHEME"      RUN_TESTS="YES"
+    - DESTINATION="OS=10.3.1,name=iPhone 7 Plus"   SCHEME="$IOS_FRAMEWORK_SCHEME"      RUN_TESTS="YES"
+    - DESTINATION="OS=9.0,name=iPhone 6"           SCHEME="$IOS_FRAMEWORK_SCHEME"      RUN_TESTS="YES"
 before_install: rvm use 2.0
 install: gem install slather
-script: xcodebuild test -project LeanCloud.xcodeproj -scheme LeanCloud -sdk iphonesimulator
+script:
+  - set -o pipefail
+  - xcodebuild -version
+  - xcodebuild -showsdks
+
+  # Build Framework in Debug and Run Tests if specified
+  - if [ $RUN_TESTS == "YES" ]; then
+      xcodebuild -project "$PROJECT" -scheme "$SCHEME" -destination "$DESTINATION" -configuration Debug ONLY_ACTIVE_ARCH=NO ENABLE_TESTABILITY=YES test | xcpretty;
+    else
+      xcodebuild -project "$PROJECT" -scheme "$SCHEME" -destination "$DESTINATION" -configuration Debug ONLY_ACTIVE_ARCH=NO build | xcpretty;
+    fi
+
+  # Build Framework in Release and Run Tests if specified
+  - if [ $RUN_TESTS == "YES" ]; then
+      xcodebuild -project "$PROJECT" -scheme "$SCHEME" -destination "$DESTINATION" -configuration Release ONLY_ACTIVE_ARCH=NO ENABLE_TESTABILITY=YES test | xcpretty;
+    else
+      xcodebuild -project "$PROJECT" -scheme "$SCHEME" -destination "$DESTINATION" -configuration Release ONLY_ACTIVE_ARCH=NO build | xcpretty;
+    fi
 after_success: slather