[scikit-learn] scikit-learn twitter account

[Olivier Grisel]

I have created the https://twitter.com/sklearn_commits twitter account.

I have applied to make this account a "Twitter Developer" account to
be able to use https://github.com/filearts/tweethook to register it as
a webhook for the main scikit-learn github repo.

Once ready, I will remove the old webhook currently registered on
@scikit_learn account and would like to tweet about the transfer as
drafted here:

https://hackmd.io/@4rHCRgfySZSdd5eMtfUJiA/H1CSpuF2S/edit

Please feel free to let me know if you have any comment / suggestion
about this plan.

-- 
Olivier