Dratio

Initial release with basic functionality for dataset download.

Main classes and methods added:
- `Client`: Allows interaction with API services
- `get(code :str)`: Gets a `Dataset` object with which to download the information.
- `get_datasets()`: Gets a list of the datasets.
- `Dataset`: Allows to obtain the dataset's information and download its content.
- `to_pandas()`: Download the dataset's content as a `Pandas` `DataFrame`.
- `to_geopandas()`: Download the dataset's content as a `GeoPandas` `GeoDataFrame`.
- `metadata`: Gets the object's information.
- `version`: Gets the object's version
- `Version`: Class with the object's version.
- `File`: Class with the information associated with a File.

New Dratio.io version:

* API key can be defined as a environment variable
* Change default override when uploading a file
* Support for non-session requests and change to new default behaviour
* Update version to 0.0.16

* Support for dataset version:
* Add method `set_version` on datasets
* Modified `upload_file` method to automatically generate a new version of the dataset when uploading a new file.
* Update provider helper tools.

- Auto merge
- Updates for new fields in API
- Helper for providers

Providers can use the API to upload dataset (preview).