OpenAPI with $ref responseBodies don't get processed correctly

[ghost]

Describe the bug
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To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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OpenAPI Spec File
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Desktop (please complete the following information):

• OS: [e.g. macOS 10.15.1]
• Python Version: [e.g. 3.8.0]
• openapi-python-client version [e.g. 0.1.0]

Additional context
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[ghost]

#664 Looks like it fixes this

[supermihi]

Any news on this? Do you consider merging the fix? Is there something that blocks that?