Apply isort to freqtrade codebase

freqtrade/vendor/qtpylib/indicators.py

@@ -19,14 +19,15 @@
 # limitations under the License.
 #
 
-import warnings
 import sys
+import warnings
 from datetime import datetime, timedelta
 
 import numpy as np
 import pandas as pd
 from pandas.core.base import PandasObject
 
+
 # =============================================
 # check min, python version
 if sys.version_info < (3, 4):