unsupport python 3.6

[callmesoul]

the ubuntu 16.04 Comes with 3.6，Downgrading is very troublesome

Using TensorFlow backend.
/usr/lib/python3.6/importlib/_bootstrap.py:219: RuntimeWarning: compiletime version 3.5 of module 'tensorflow.python.framework.fast_tensor_util' does not match runtime version 3.6
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