New release to support Python 3.7.0+

[dmgolembiowski]

Can new release be pushed to https://pypi.org/ any time soon?

[nshmyrev]

Sure, but I need to update it to pytorch first. Help is appreciated.

[loretoparisi]

Just adding that for me inference from a pre-trained dictionary it works with

setuptools>=41.0.0
tensorflow
tensor2tensor

so with TF 1.14.0, latest T2T on pip3 and python 3.7.3.
The training instead it does not work, and I'm getting this #179 error.

[b00f]

Also this library is slow in Python2.7. Appreciate new update...