Fix 404 on openapi spec

[dimmaski]

I'm running into issues when running the following command, against an API generated by fastapi-crudrouter (which is great btw 🥇 )

>> openapi-generator validate -i http://127.0.0.1:8000/openapi.json
Validating spec (http://127.0.0.1:8000/openapi.json)
Errors:
	- attribute paths.'/tag/{item_id}'(get).responses.404.detail is unexpected
	- attribute paths.'/project/{item_id}'(get).responses.404.detail is unexpected
	- attribute paths.'/tag/{item_id}'(delete).responses.404.detail is unexpected
	- attribute paths.'/project/{item_id}'(delete).responses.404.detail is unexpected
	- attribute paths.'/project/{item_id}'(put).responses.404.detail is unexpected
	- attribute paths.'/tag/{item_id}'(put).responses.404.detail is unexpected

[error] Spec has 6 errors.

I believe this PR resolves #105. Picking up on the great example left by @sondrelg at #104.

I believe this should also help resolve this PR #141.

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[mitaka]

I can confirm that this is an issue. Can you please fix the lint issue?

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[dimmaski]

@mitaka, giving it a try :)

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