It seems that SemaPhoreCI doesn't provide such functionality, or I didn't find it.
TravisCI on the other had does.
In either case, not selected CI is important, but in fact, that library tests are run in all those environments to ensure most compatibility. Currently is set to elixir 1.7.4.
Previously manually fixed issues, that occurred in CI (because it was set to 1.3.4) but locally used 1.7...