Error fix

[vandana-rajan]

Hi,

This is not an issue. But a note of the working configuration for recurrentshop and seq2seq for the benefit of people who might face the same issue as me.

Initially I tried using this package and seq2seq with Python 3+. But I was getting an error
***** ValueError: Shapes must be equal rank, but are 3 and 2.** while running the example of seq2seq with attention from the readme file.

When I switched to Python 2.7, Keras 2.2.4 and tensorflow 1.14.0, I am able to successfully run that example.