Added
- A new field `version` in UbiConfig class.
- GitlabLoader now populates the `UbiConfig.version` field while loading config.
Fixed
- LocalLoader couldn't load all config files correctly.
Changed
- **API break**: `recursive` option is now removed from all loaders. While using
LocalLoader to load all config files from a directly, it now load all config files
from its subdirectories automatically.