Update .travis.yml

travis

Author: khoogheem

.travis.yml

@@ -8,7 +8,7 @@ xcode_project: DataDecoder.xcodeproj
 xcode_scheme: DataDecoderTests
 os: osx
 osx_image: xcode9.0
-xcode_sdk: iphonesimulator11.0
+xcode_sdk: macosx10.13
 
 script:
 - xcodebuild clean build test -project DataDecoder.xcodeproj -scheme DataDecoderTests