(ci)Report Test Coverage to Code Climate

[Francisco Avila Beltran (elfrank)]

Brief Description

Update Travis CI configuration to report unit test coverage to Code
Climate.

Pull Request Guidelines

• I have added pull requests labels which describe my contribution.
• All existing tests passed.
  • I have added tests to cover my changes, of which pass.
• I have compared the render output of my branch to master.
• My code has passed the ESLint configuration for this project.
• My change requires modifications to the documentation.
  • I have updated the documentation accordingly.