Update to python-social 3.0.0

[troeger]

This is needed to keep to Google login functional after January 2019.

[troeger]

There is also a problem with GitHub login now:

=== snip ===

Hi @troeger,

On February 4th, 2020 at 09:21 (UTC) your application (ORE) used an access token (with the User-Agent python-requests/2.21.0) as part of a query parameter to access an endpoint through the GitHub API:

https://api.github.com/user

Please use the Authorization HTTP header instead as using the access_token query parameter is deprecated.

Depending on your API usage, we'll be sending you this email reminder once every 3 days for each token and User-Agent used in API calls made on your behalf.
Just one URL that was accessed with a token and User-Agent combination will be listed in the email reminder, not all.

Visit https://developer.github.com/changes/2019-11-05-deprecated-passwords-and-authorizations-api/#authenticating-using-query-parameters for more information.

Thanks,
The GitHub Team