Update ReadME.md

ReadME.md

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 	5.4  Keras Demo2：[Demo2](https://www.bilibili.com/video/av10590361/?p=19)  
 
 **作业 Week5：**:  
-深度神经网络[Keras实现手写数字识别](https://github.com/dafish-ai/NTU-Machine-learning/blob/master/%E6%9D%8E%E5%BC%98%E6%AF%85-%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0-%E4%BD%9C%E4%B8%9A/Week5%20-%20%20Keras%E5%AE%9E%E7%8E%B0%E6%89%8B%E5%86%99%E6%95%B0%E5%AD%97%E8%AF%86%E5%88%AB.md)
+深度神经网络[Keras实现手写数字识别](https://github.com/dafish-ai/NTU-Machine-learning/blob/master/%E6%9D%8E%E5%AE%8F%E6%AF%85%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0-%E4%BD%9C%E4%B8%9A/week5/Week5-Keras%E5%AE%9E%E7%8E%B0%E6%89%8B%E5%86%99%E6%95%B0%E5%AD%97%E8%AF%86%E5%88%AB.md)
 
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 ### Week 6