Update README.md

README.md

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 | TBD | (直播-Discussion)   <br> MCMC之Metroplis Hasting算法 |||||
 | TBD | (直播-Discussion)   <br> MCMC之Metroplis Hasting算法 |||||
 | TBD | (直播-Discussion)   <br> Bayesian Neural Network |||||
 | TBD | (直播-Discussion)   <br> Bayesian Neural Network |||||
 | TBD | (直播-Paper)   <br>  |||[Dropout as a Bayesian Approximation:Representing Model Uncertainty in Deep Learning](https://arxiv.org/pdf/1506.02142.pdf)||
 | TBD | (直播-Paper)   <br>  |||[Dropout as a Bayesian Approximation:Representing Model Uncertainty in Deep Learning](https://arxiv.org/pdf/1506.02142.pdf)||
-| 9月27日 （周日） 10:30AM  | (直播-Lecture19)   <br> 概率图模型-2 |吉布斯采样、变分法||||
+| 9月26日 （周六） 10:30AM  | (直播-Lecture19)   <br> 概率图模型-2 |吉布斯采样、变分法||||
 | TBD  | (直播-Discussion)  <br> 项目五讲解 |||||
 | TBD  | (直播-Discussion)  <br> 项目五讲解 |||||
 | TBD  | (直播-Lecture20)   <br> 概率图模型-3 |||||
 | TBD  | (直播-Lecture20)   <br> 概率图模型-3 |||||