To build on Xcode 11.3.1 (build 11C505) right now, just continue to use
osx_image: xcode11.3 in your .travis.yml file.
This release fixed a crash that could occur when using an attributed string in a UILabel. It reduced the size of dependency files (.d) produced by the Swift compiler, which can improve incremental build times and disk usage for targets with many source files; according to Apple.
Please refer to our documentation to learn more about macOS builds
And if you have any questions or issues, you can always reach us via email@example.com