Problem
I added a .probo.yaml file to my repository and opened a pull request, but I do not see a build.
Solution
Validate the contents of your .probo.yaml file with a tool like http://www.yamllint.com/ and update your configuration file with the fixed yaml.
Explanation
Probo builds will fail to trigger if the configuration file contains invalid yaml. We recommend linting your configuration file when you first write it and after you make any significant changes.