Update README.md

Author: krzjoa

README.md

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 * [Netron](https://github.com/lutzroeder/Netron) - Visualizer for deep learning and machine learning models (no Python code, but visualizes models from most Python Deep Learning frameworks).
 * [FlashLight](https://github.com/dlguys/flashlight) - Visualization Tool for your NeuralNetwork.
 * [tensorboard-pytorch](https://github.com/lanpa/tensorboard-pytorch) - Tensorboard for PyTorch (and chainer, mxnet, numpy, ...).
-* [mxboard](https://github.com/awslabs/mxboard) - Logging MXNet data for visualization in TensorBoard. <img height="20" src="img/mxnet_big.png" alt="MXNet based">
 
 ## Genetic Programming
 * [gplearn](https://github.com/trevorstephens/gplearn) - Genetic Programming in Python. <img height="20" src="img/sklearn_big.png" alt="sklearn">