App bug fix.

app.py

@@ -106,7 +106,7 @@ def plot_results(pil_img, prob, boxes):
     for p, (xmin, ymin, xmax, ymax) in zip(prob, boxes.tolist()):
         cl = p.argmax()
         c = colors[cl]
-        c1, c2 = (xmin, ymin), (xmax, ymax)
+        c1, c2 = (int(xmin), int(ymin)), (int(xmax), int(ymax))
 
         cv2.rectangle(img, c1, c2, c, thickness=2, lineType=cv2.LINE_AA)
         # cv2.text(