[ feature request ] Add settings for the `versions` linter

Currently, the [`versions`](https://reugn.github.io/github-ci/linters/versions.html) linter is non-configurable. This causes the following effect:

```yaml
linters:
  default: all
  disable:
    - versions # 👈 this has to be disabled...

upgrade:
  actions: {}
  format: tag # 👈 ...because this is enabled

```

In consequence, `github-ci lint` allows mixed style.