Changes to Options expiration dates

added UpstreamErrorResponse subschema #2 to the response body oneOf list for the response status 503

the response's body type changed from object to no type for status 503

removed the required property error from the response with the 503 status

removed the optional property code from the response with the 503 status

removed the optional property detail from the response with the 503 status

removed the optional property hint from the response with the 503 status

removed the optional property plan from the response with the 503 status

removed the optional property reason from the response with the 503 status

added the non-success response with the status 500

added the non-success response with the status 502

added the non-success response with the status 504

added the optional property meta/stale_since to the response with the 200 status

added the optional property meta/data_age_days to the response with the 200 status

added the optional property meta/notes to the response with the 200 status

added the optional property meta/period to the response with the 200 status

the response property data/count became optional for the status 200

the response property data/expirations became optional for the status 200

the response property data/symbol became optional for the status 200

response property data/count list-of-types was widened by adding types null and number to media type application/json of response 200

response property data/expirations list-of-types was widened by adding types null to media type application/json of response 200

response property data/symbol list-of-types was widened by adding types null to media type application/json of response 200

added the optional property code to the response with the 401 status

added the optional property code to the response with the 429 status

added the optional property code to the response with the 503 status

added the optional property hint to the response with the 401 status

added the optional property hint to the response with the 429 status

added the optional property hint to the response with the 503 status

added the optional property plan to the response with the 401 status

added the optional property plan to the response with the 429 status

added the optional property plan to the response with the 503 status

added the optional property reason to the response with the 401 status

added the optional property reason to the response with the 429 status

added the optional property reason to the response with the 503 status