Issue 8221

[joeboyscout04]

PR checklist

• [X] Read the contribution guidelines.
• [X] Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• [X] Filed the PR against the correct branch: 3.0.0 branch for changes related to OpenAPI spec 3.0. Default: master.
• [X] Copied the technical committee to review the pull request if your PR is targeting a particular programming language. @ehyche

Description of the PR

I added compatibility for unwrapRequired config option for Swift 4 to fix #8221.

I couldn't get the integration tests to work properly, they keep timing out, but this was happening before I made any changes anyway. Hope we can get a speedy review!

[joeboyscout04]

Can I get a maintainer to review and merge this one please?

[swagger-bot]

Hey Meat Bag! Your Pull Request Build Passed! 743 tests run, 5 skipped, 0 failed.