Bump travis from 1.8.12 to 1.8.13
Bump travis from 1.8.12 to 1.8.13

Bumps [travis](https://github.com/travis-ci/travis.rb) from 1.8.12 to 1.8.13.
- [Release notes](https://github.com/travis-ci/travis.rb/releases)
- [Commits](https://github.com/travis-ci/travis.rb/compare/v1.8.12...v1.8.13)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Floppy/healthboard,Floppy/healthboard