Format specified for json file containing title and abstract is wrong.

[coolshr]

The format specified in the README is

{
    'doc_id': {'title': 'representation learning of scientific documents',
    'abstract': 'we propose a new model for representing abstracts'},
}

However, the correct format is

{
    'doc_id': {'title': 'representation learning of scientific documents',
    'abstract': 'we propose a new model for representing abstracts',
    'paper_id': 'doc_id'},
}