Update .travis.yml

Author: wongzigii

.travis.yml

@@ -4,4 +4,4 @@ xcode_sdk: iphonesimulator10.0
 env:
   - PLATFORM="ios" SCHEME="AlamofireSwiftyJSON" DESTINATION="platform=iOS Simulator,name=iPhone SE,OS=10.0"
 script:
-  - set -o pipefail && xcodebuild -project Alamofire-SwiftyJSON.xcodeproj -scheme $SCHEME -destination $DESTINATION build-for-testing test | xcpretty
+  - set -o pipefail && xcodebuild -project Alamofire-SwiftyJSON.xcodeproj -scheme $SCHEME -destination "$DESTINATION" build-for-testing test | xcpretty