change convert_objects() to Series.infer_objects()

[scottdangelo]

df['GuageHeight(feet)'] = df['GuageHeight(feet)'].convert_objects(convert_numeric=True)
df['Discharge(cfs)'] = df['Discharge(cfs)'].convert_objects(convert_numeric=True)

yields:

/Users/scott/.pyenv/versions/3.6.5/lib/python3.6/site-packages/ipykernel_launcher.py:1: FutureWarning: convert_objects is deprecated.  To re-infer data dtypes for object columns, use Series.infer_objects()
For all other conversions use the data-type specific converters pd.to_datetime, pd.to_timedelta and pd.to_numeric.
  """Entry point for launching an IPython kernel.
/Users/scott/.pyenv/versions/3.6.5/lib/python3.6/site-packages/ipykernel_launcher.py:2: FutureWarning: convert_objects is deprecated.  To re-infer data dtypes for object columns, use Series.infer_objects()
For all other conversions use the data-type specific converters pd.to_datetime, pd.to_timedelta and pd.to_numeric.