TST: remove pandas-datareader xfail as 0.4.0 works (#16374)

Author: jreback

pandas/tests/test_downstream.py

@@ -84,12 +84,10 @@ def test_pandas_gbq(df):
     pandas_gbq = import_module('pandas_gbq')  # noqa
 
 
-@pytest.mark.xfail(reason=("pandas_datareader<=0.3.0 "
-                           "broken w.r.t. pandas >= 0.20.0"))
 def test_pandas_datareader():
 
     pandas_datareader = import_module('pandas_datareader')  # noqa
-    pandas_datareader.get_data_yahoo('AAPL')
+    pandas_datareader.get_data_google('AAPL')
 
 
 def test_geopandas():