Generation of .gitlab-ci doesn't work

Created by: sorasful

Hello there !

I just tried this project that looks really awesome! And I noticed that despite checking the "Gitlab-ci" box when selecting CI, it doesn't happen. The rest of the options seems to be working nicely but I got this :

So, when looking a little bit, I found the problem was during the declaration of the possibles values in input_models we have this :

@enum.unique
class CIType(enum.Enum):
    none = "none"
    gitlab_ci = "gitlab"
    github = "github"

But when looking at the conditional_files.json we check for gitlab_ci and not just gitlab:

    "Gitlab CI": {
        "enabled": "{{cookiecutter.ci_type == 'gitlab_ci'}}",
        "resources": [
            ".gitlab-ci.yml"
        ]
    },

And after updating it, it now works. I will submit a PR for this.