Show errors for Travis failures.
Show errors for Travis failures.

Compare to Dagger:
https://github.com/google/dagger/blob/6a6d78289bc9fa11b17019eb4fd847c723e9e8fa/.travis.yml#L40

RELNOTES=n/a
PiperOrigin-RevId: 336129570

google/flogger,google/flogger