csvmap.go
func (r *Reader) ReadHeader() (columns []string, err error) {
	return r.Reader.Read()
}
func (r *Reader) ReadHeader() (columns []string, err error) {
	return r.Reader.Read()
}
func ( r * Reader ) ReadHeader ( ) ( columns [ ] string , err error ) { return r . Reader . Read ( ) }
// ReadHeader simply wraps csv.Reader.Read().
ReadHeader simply wraps csv . Reader . Read () .