Errors with '$' in field name

[glickbot]

Normal '$ref' fields are handled, but for APIs that define fields that are called '$ref', it tries to use '$ref' as the identifier, which throws an error:

disco get discovery v1 --openapi3 && gnostic openapi3-discovery-v1.pb --go-client-out=discovery
Errors reading openapi3-discovery-v1.pb
Plugin error: [types.go:13:1: illegal character U+0024 '$']