v2.4.0

• #72 security_schemes(SecurityScheme) supports a json format.
• #68 feat: Add operation_id_callback. Thanks, @BoyanYK.
• #64 Explains the usage of flask openapi command more clearly. Thanks, @candleindark.
• #75 Init view_class and pass view_kwargs. Thanks, @stufisher.
• #70 Support for Specification Extensions in OpenAPI Object and Operation Object. Thanks, @simonblund.
• #73 BaseModel Config support openapi_extra.
• Merge extra_responses to responses and deprecate extra_responses.

DeprecationWarning:

• Add DeprecationWarning to APIKey, HTTPBase, OAuth2, OpenIdConnect, HTTPBearer that will be deprecated in v3.0.
• Add DeprecationWarning to extra_form, extra_body and extra_responses that will be deprecated in v3.0.