DOC: Outdated Python version in contributing docs

[hasan-yaman]

Location of the documentation

URL of the documentation

Note: You can check the latest versions of the docs on master here.
(Problem exist in the latest version: here)

Documentation problem

In the documents, it says at least Python 3.6.1 installed to create Python virtual environment to contribute Pandas. However, to install some development requirements (such as NumPy) Python version must be >=3.7. See here for NumPy minimum requirement.

Suggested fix for documentation

We should update the relevant document so contributors can install an appropriate virtual environment for contribution.
Suggested edit:
You’ll need to have at least Python 3.7 installed on your system.

[hasan-yaman]

I can take the issue if the proposed solution is fine.

[hasan-yaman]

take

[rhshadrach]

Thanks for the report @hasan-yaman! PR to fix is most certainly welcome. I would consider leaving the python requirement vague (e.g. something like "you need to have at least the minimum python version that pandas supports") along with a link to the minimum version page. That way we don't have to routinely update the number.