Fix missing url passing when using a custom authenticator

[gthomas-slack]

Description

Fixes a bug with passing the url from the configuration when using a Custom Authenticator. Fixes #683 - see this issue for more details.

Checklist

• Wrote a description of my changes above
• Added a bullet point for my changes to the top of the CHANGELOG.md file
• Added or modified unit tests to reflect my changes
• Manually tested with a notebook
• If adding a feature, there is an example notebook and/or documentation in the README.md file

[devstein]

Thanks for contributing! I'll include this in a new patch release as soon as I can

[itamarst]

Unit test would be nice too, @gthomas-slack.

Also, would you be interested in being given commit access? You'd have to agree to following the development process, and the code of conduct.

[VasuBhog]

Would this be patched into the 0.17.0 version or released with the next 0.18.0 release? What would be the timeframe for either option?

[devstein]

@VasuBhog It will be a new patch release 0.17.1. I'll release it in the next few hours