As many endpoints that use the shared ListOptions struct do not support filtering by name, it might be a bit misleading for users to include it here. I think it might be better to follow the pattern already used by Droplets and domain records by adding a new ListByName method to the certificate service. e.g.:

godo/droplets.go

Line 20 in d5fe4d2

ListByName(context.Context, string, *ListOptions) ([]Droplet, *Response, error)

godo/domains.go

Line 22 in d5fe4d2

RecordsByName(context.Context, string, string, *ListOptions) ([]DomainRecord, *Response, error)

Thoughts?

@andrewsomething I have made changes as requested. pls review :)