fix demo readme

Author: yunlongdong

demo/readme.md

@@ -3,7 +3,7 @@ Here we release some supported demos.
 
 ## CRAFT text detector
 Demo for scene text detector with model [CRAFT](https://github.com/clovaai/CRAFT-pytorch).
-Run ```python main.py``` inside folder ```craft_text_detector```. 3 files (same level folder with ```main.py```) are needed (craft.txt, [craft.npy](), [craft_bn.npy]())
+Run ```python main.py``` inside folder ```craft_text_detector```. 2 files (same level folder with ```main.py```) are needed (craft.txt, [craft.npy]())
 The detected result is shown as following: 
 ![](https://raw.githubusercontent.com/Image-Py/cnnumpy/master/demo/craft_text_detector/rst.png)