Closes #912

[davidkartchner]

Closes 912

• Confirm that this PR is linked to the dataset issue.
• Create the dataloader script hub/hub_repos/my_dataset/my_dataset.py (please use only lowercase and underscore for dataset naming).
• Provide values for the _CITATION, _DATASETNAME, _DESCRIPTION, _HOMEPAGE, _LICENSE, _URLs, _SUPPORTED_TASKS, _SOURCE_VERSION, and _BIGBIO_VERSION variables.
• Implement _info(), _split_generators() and _generate_examples() in dataloader script.
• Make sure that the BUILDER_CONFIGS class attribute is a list with at least one BigBioConfig for the source schema and one for a bigbio schema.
• Confirm dataloader script works with datasets.load_dataset function.
• Confirm that your dataloader script passes the test suite run with python -m tests.test_bigbio_hub <dataset_name> [--data_dir /path/to/local/data] --test_local.
• If my dataset is local, I have provided an output of the unit-tests in the PR (please copy paste). This is OPTIONAL for public datasets, as we can test these without access to the data files.

[phlobo]

Hi @davidkartchner, please have a look at my comments, I cannot run the unit tests at the moment due to a wrong import. Also, I guess the requirements.txt was deleted accidentally.

[phlobo]

@mariosaenger I implemented the requested changes myself, could you please have a final look at the PR before merging?

[mariosaenger]

LGTM. Thanks for implementing and fixing this!