argmin is deprecated

[moorepants]

gaitanalysis.tests.test_motek.TestDFlowData.test_extract_processed_data ... /home/moorepants/miniconda3/envs/gaitanalysistoolkit-dev/lib/python2.7/site-packages/numpy/core/fromnumeric.py:51: FutureWarning: 'argmin' is deprecated, use 'idxmin' instead. The behavior of 'argmin'
will be corrected to return the positional minimum in the future.
Use 'series.values.argmin' to get the position of the minimum now.
  return getattr(obj, method)(*args, **kwds)