async query does not work

[ijiraq]

@andamian when running the latest astroquery I get this error when trying to do an async query:

In [13]: c.run_query(query, operation='async', output_file='test.csv', background=True)
WARNING: AstropyDeprecationWarning: Use exec_sync or create_async instead [warnings]

NotImplementedError Traceback (most recent call last)
in
----> 1 c.run_query(query, operation='async', output_file='test.csv', background=True)

/anaconda3/lib/python3.7/site-packages/astropy/utils/decorators.py in deprecated_func(*args, **kwargs)
122 warnings.warn(message, category, stacklevel=2)
123
--> 124 return func(*args, **kwargs)
125
126 # If this is an extension function, we can't call

/anaconda3/lib/python3.7/site-packages/astroquery/cadc/core.py in run_query(self, query, operation, output_file, output_format, verbose, background, upload_resource, upload_table_name)
658 A Job object
659 """
--> 660 raise NotImplementedError('No longer supported. '
661 'Use exec_sync or create_async instead.')
662

NotImplementedError: No longer supported. Use exec_sync or create_async instead.