func (s Series) String() string {
	if s.Title == "" {
		return ""
	}
	return fmt.Sprintf("%s #%.1f", s.Title, s.Position)
}
String returns series name and book position.
package gr
import (
	"encoding/xml"
	"fmt"
	"strconv"
	"strings"
	"time"
	"github.com/fxtlabs/date"
	"github.com/pkg/errors"
)
const seriesURL = "https://www.goodreads.com/series/%d?format=xml&key=%s"
type Series struct {
	Title    string   
	Position float64  
	ID       int64    
	Books    []Book   
}