import error while working with pandas v0.20.1

[zhuoqiang]

after upgrade pandas to v0.20.1, there is import error while using pandas-datareader lib:

/lib/python3.6/site-packages/pandas_datareader/_utils.py in <module>()
      3 
      4 import pandas as pd
----> 5 from pandas.core.common import PandasError
      6 from pandas import to_datetime
      7 

ImportError: cannot import name 'PandasError'

from pandas doc, v0.20 changes the sub-module structure, see http://pandas.pydata.org/pandas-docs/stable/whatsnew.html#pandas-errors

[jreback]

this was fixed by #304

a new release will be issued soon