Accept 1 and y as true values for use_prerelease_versions

[davisagli]

Fixes #47

[stevepiercy]

Could you use this class and methods from cookiecutter instead?

https://github.com/cookiecutter/cookiecutter/blob/b4451231809fb9e4fc2a1e95d433cb030e4b9e06/cookiecutter/prompt.py#L45-L80

I happened to be looking for how to validate any input for #58 (comment).

[davisagli]

@stevepiercy Maybe but it wasn't clear to me how to designate a cookiecutter field as boolean and this gets more complicated if we try to change the type/value that is already returned. So I went with a simple solution.

[stevepiercy]

@davisagli usage is in https://cookiecutter.readthedocs.io/en/stable/advanced/boolean_variables.html. I don't know if showing the default option of False for the prompt is better than No in this case.

[rohnsha0]

works for me!

although, I would like:-

[7/17] Should we use prerelease versions? (No):

be changed to:-

[7/17] Should we use prerelease versions? [y/n] (n):