Update keras logo

README.md

 # Keras: Deep Learning for Python
 
-![Keras logo](https://s3.amazonaws.com/keras.io/img/keras-logo-2018-transparent-large.png)
+![Keras logo](https://s3.amazonaws.com/keras.io/img/keras-logo-2018-large-1200.png)
 
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docs/templates/index.md

 # Keras: The Python Deep Learning library
 
+<img src='https://s3.amazonaws.com/keras.io/img/keras-logo-2018-large-1200.png', style='max-width: 600px;'>
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