venues.go
func (s *VenueService) SetHeader(key, value string) *VenueService {
	s.sling.Set(key, value)
	return s
}
func (s *VenueService) SetHeader(key, value string) *VenueService {
	s.sling.Set(key, value)
	return s
}
// SetHeader sets a header to be sent with the request for internationalization
// https://developer.foursquare.com/docs/api/configuration/versioning