chore(travis): use xcode 11.6 image

Christian Elies · Christian Elies · commit 7b438ad28c36 · 2020-07-29T22:31:48.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: swift
-osx_image: xcode11.3
+osx_image: xcode11.6
 script:
   - swift package generate-xcodeproj
   - xcodebuild clean test -destination 'name=iPhone 8' -scheme AdvancedList-Package -enableCodeCoverage YES -derivedDataPath .build/derivedData -quiet
