Update README.md

Author: zsdonghao

README.md

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 TensorLayer is a deep learning and reinforcement learning library based on [Google TensorFlow](https://www.tensorflow.org). It provides rich data pre-processing,  training, post-processing and serving modules that help researchers and engineers in building complex machine learning workflows.  
 
 # What's New
-* Support [SubpixelConv2d](http://tensorlayer.readthedocs.io/en/latest/modules/layers.html#super-resolution-layer) for Super-resolution.
+* Support [Sub-pixel Convolution](http://tensorlayer.readthedocs.io/en/latest/modules/layers.html#super-resolution-layer) for Super-resolution.
 * You can now use TensorLayer with [TF-Slim](http://tensorlayer.readthedocs.io/en/latest/modules/layers.html#connect-tf-slim) and [Keras](http://tensorlayer.readthedocs.io/en/latest/modules/layers.html#connect-keras) together!
 * Compatible with TensorFlow 1.0.1 release.