Close the reponse after a redirect to avoid double redirects.

[jwoertink]

Purpose

Fixes #1735

Description

Coming up in Crystal 1.7, HTTP response will have a redirect method built-in. That method calls close after setting the Location header. I think this might also fix this elusive bug https://forum.crystal-lang.org/t/help-solving-io-error/130

Checklist

• [x] - An issue already exists detailing the issue/or feature request that this PR fixes
• [x] - All specs are formatted with crystal tool format spec src
• [x] - Inline documentation has been added and/or updated
• [x] - Lucky builds on docker with ./script/setup
• [x] - All builds and specs pass on docker with ./script/test

[jwoertink]

I'm gonna hold this open for a day. That nightly should have worked, but maybe they need to push an update....