fixed more with imports

Author: AxelGard

cira/strategy/backtest.py

@@ -1,7 +1,7 @@
 import pandas as pd
 import numpy as np
 from typing import List
-from . import Strategy, ByAndHold
+from .strategy import Strategy, ByAndHold
 
 
 FEE_RATE = 0.004 # this is what alpaca takes 

examples/linear.ipynb

@@ -271,7 +271,7 @@
     "from typing import List\n",
     "from pandas import DataFrame\n",
     "\n",
-    "from cira.strategy import Strategy\n",
+    "from cira.strategy.strategy import Strategy\n",
     "\n",
     "\n",
     "class MyStrat(Strategy):\n",