Fix travis build error

Author: Bruce-pac

.travis.yml

@@ -10,5 +10,5 @@ before_install:
 - gem install cocoapods # Since Travis is not always on latest version
 - pod install --repo-update --project-directory=Example
 script:
-- set -o pipefail && xcodebuild test -enableCodeCoverage YES -workspace Example/RxIGListKit.xcworkspace -scheme RxIGListKit-Example -sdk iphonesimulator9.3 ONLY_ACTIVE_ARCH=NO | xcpretty
+- set -o pipefail && xcodebuild test -enableCodeCoverage YES -workspace Example/RxIGListKit.xcworkspace -scheme RxIGListKit-Example -sdk iphonesimulator ONLY_ACTIVE_ARCH=NO | xcpretty
 - pod lib lint