Adding Difference-of-Proportions Example

[freddyaboulton]

Hi,

This is in reference to issue #189 . I have created an example script showing how to test whether two proportions are equal via logistic regression. Can I get permission to push my branch and create a PR?

Thank you!

[fehiepsi]

Hi @freddyaboulton , thanks for the contribution! I believe you can push your branch to your fork and make a PR without problems. Let me know if you get any issues.

[freddyaboulton]

Thanks @fehiepsi ! I created #581 .