Add additional information on what installers don't have this brownout

[hmaarrfk]

I'm hoping to remove the brownout on the one next release.

Closes #625
cc: @orbsmiv

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.