Update shapash_report_example.py to fix report demo

tutorial/generate_report/shapash_report_example.py

@@ -4,12 +4,15 @@
 that generates the same report.
 """
 import os
+import sys
 
 import pandas as pd
 from category_encoders import OrdinalEncoder
 from sklearn.ensemble import RandomForestRegressor
 from sklearn.model_selection import train_test_split
 
+sys.path.insert(0, "../../..")
+
 from shapash import SmartExplainer
 from shapash.data.data_loader import data_loading