Attribute Error

```
$ python process_data.py
Traceback (most recent call last):
File "process_data.py", line 1, in
import featuretools as ft
File "/home/fh/.local/lib/python2.7/site-packages/featuretools/__init__.py", line 5, in
from .entityset.api import *
File "/home/fh/.local/lib/python2.7/site-packages/featuretools/entityset/__init__.py", line 2, in
from .api import *
File "/home/fh/.local/lib/python2.7/site-packages/featuretools/entityset/api.py", line 3, in
from .entityset import EntitySet
File "/home/fh/.local/lib/python2.7/site-packages/featuretools/entityset/entityset.py", line 5, in
import dask.dataframe as dd
File "/home/fh/.local/lib/python2.7/site-packages/dask/dataframe/__init__.py", line 12, in
from .rolling import (rolling_count, rolling_sum, rolling_mean, rolling_median,
File "/home/fh/.local/lib/python2.7/site-packages/dask/dataframe/rolling.py", line 200, in
rolling_count = wrap_rolling(pd.rolling_count, 'count')
AttributeError: 'module' object has no attribute 'rolling_count'

```