Fix Prophet.resample_time_stamps bug

[rafaelleinio]

Why?

When giving time_stamps=1 for method Prophet.resample_time_stamps, it returns an empty np array.

What?

This PR fixes a bug on the resample_time_stamps method in the Prophet class when passing an integer to the time_stamps arg.

How?

• Fix the value passed to periods argument in pd.date_range function.
• Add new unit test for Prophet.resample_time_stamps asserting this functionality

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @rafaelleinio to sign the Salesforce.com Contributor License Agreement.

[aadyotb]

Hi @rafaelleinio, thanks for the contribution! Can you sign our CLA so I can get the PR merged?

[rafaelleinio]

Hi @rafaelleinio, thanks for the contribution! Can you sign our CLA so I can get the PR merged?

@aadyotb I followed the instructions but I got into an error message. Now when I try to sign again it says that I have already signed. Idk what happened to be honest, can you help me with that? 😅

[aadyotb]

@rafaelleinio I think I just needed to close and re-open the PR. The CLA looks all good now :)