fix tslib deprecation

catalyst/utils/calendars/exchange_calendar_ice.py

@@ -7,7 +7,7 @@ from pandas.tseries.holiday import (
     USLaborDay,
     USThanksgivingDay
 )
-from pandas.tslib import Timestamp
+from pandas import Timestamp
 from pytz import timezone
 
 from catalyst.utils.calendars import TradingCalendar

tests/calendars/test_trading_calendar.py

@@ -24,7 +24,7 @@ import numpy as np
 import pandas as pd
 from nose_parameterized import parameterized
 from pandas import read_csv
-from pandas.tslib import Timedelta
+from pandas import Timedelta
 from pandas.util.testing import assert_index_equal
 from pytz import timezone
 from toolz import concat

tests/test_data_portal.py

@@ -17,7 +17,7 @@ from collections import OrderedDict
 from numpy import array, append, nan, full
 from numpy.testing import assert_almost_equal
 import pandas as pd
-from pandas.tslib import Timedelta
+from pandas import Timedelta
 
 from catalyst.assets import Equity, Future
 from catalyst.data.data_portal import HISTORY_FREQUENCIES, OHLCV_FIELDS