Update app.py

app.py

@@ -17,6 +17,8 @@ My objective here is to build my first image classifier using Keras. Rare Pokemo
 User should upload a landscape image with the Pokemon card image positioned upright in the centre of the photo
 """
 import os
+
+os.system('apt-get update && apt-get install -y python3-opencv')
 os.system('pip install opencv-python')
 import cv2
 from PIL import Image