add requirement

code/face_detection.py

@@ -8,7 +8,7 @@ import joblib
 class FaceDetection(object):
     def __init__(self):
         self.detector = dlib.get_frontal_face_detector()
-        self.predictor = joblib.load('./shape_predictor_68_face_landmarks_predictor.pkl')
+        self.predictor = joblib.load('./code/shape_predictor_68_face_landmarks_predictor.pkl')
         self.fa = face_utils.FaceAligner(self.predictor, desiredFaceWidth=256)
 
     def face_detect(self, frame):