Update README.md

README.md

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 # vat_tf
 Tensorflow implementation for reproducing the semi-supervised learning results on SVHN and CIFAR-10 dataset in the paper "Virtual Adversarial Training: a Regularization Method for Supervised and Semi-Supervised Learning" http://arxiv.org/abs/1704.xxxxx
 
-### Requirement
+### Requirements
 tensorflow-gpu 1.0.0, scipy(for ZCA whitening)
 
 ## Preparation of dataset for semi-supervised learning