Update README.md

Author: xxg1413

README.md

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 - [Machine Learning with Python](https://github.com/xxg1413/MachineLearning)  
 - [Python-Algorithms](https://github.com/xxg1413/Python-Algorithms)
 - [python-cookbook](https://github.com/xxg1413/python-cookbook)
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+#### 2019-08-20 update
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+飞蟒学习小组内测中，欢迎大家参加内测
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+内测微信群
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+![](qrcode.png)