Rasa: Python 3.7 support

[parthsharma1996]

Issue: When can we expect python 3.7 support?
I see that tensorflow 1.12 is required for installing the tensorflow pipeline. Are there any breaking changes in tensorflow 1.13 which is preventing the upgrade to tensorflow 1.13?

The rest of my team is switching so python 3.7 support would be nice.

[akelad]

Thanks for raising this issue, @tmbo will get back to you about it soon.

[tmbo]

Yes, def - thanks for the headsup wasn't aware that the new 1,13rc1 finally contains this (ref https://github.com/tensorflow/tensorflow/issues/17022).

So I guess it is time for us to support it as well :rocket: - I'll create a branch and a WIP PR just to check if tests pass.

[nmstoker]

Good news: 1.13.1 is released now, no longer just RC:
https://github.com/tensorflow/tensorflow/releases/tag/v1.13.1

[tmbo]

awesome, @Ghostvv how did the 1.13 tensorflow work out for you locally?

[Ghostvv]

I installed the latest version of numpy with pip install -U numpy and there were another library, I don't remember, also upgraded to latest