Update app.py

app.py

@@ -4,7 +4,7 @@ import sys
 import subprocess
 
 subprocess.check_call([sys.executable, '-m', 'pip', 'install', 
-'xgboost sklearn pymystem3 pandas'])
+'xgboost', 'sklearn', 'pymystem3', 'pandas'])
 
 import pandas as pd
 from sklearn.utils import shuffle