Add flake8 plugins and implement small improvements

freqtrade/freqtradebot.py

@@ -34,7 +34,7 @@ class FreqtradeBot(object):
     This is from here the bot start its logic.
     """
 
-    def __init__(self, config: Dict[str, Any])-> None:
+    def __init__(self, config: Dict[str, Any]) -> None:
         """
         Init all variables and object the bot need to work
         :param config: configuration dict, you can use the Configuration.get_config()

freqtrade/optimize/backtesting.py

@@ -13,7 +13,7 @@ from typing import Any, Dict, List, NamedTuple, Optional
 from pandas import DataFrame
 from tabulate import tabulate
 
-import freqtrade.optimize as optimize
+from freqtrade import optimize
 from freqtrade import DependencyException, constants
 from freqtrade.arguments import Arguments
 from freqtrade.configuration import Configuration