omdb: make Rated accessible via filters

Closes #28

media/omdb/media.go

@@ -66,5 +66,6 @@ func (c *Client) GetItem(imdbId string) (*Item, error) {
 		ImdbVotes:      util.Atoi(util.StripNonNumeric(b.ImdbVotes), 0),
 		Language:       b.Language,
 		Country:        b.Country,
+		Rated:          b.Rated,
 	}, nil
 }

media/omdb/struct.go

@@ -40,4 +40,5 @@ type Item struct {
 	ImdbVotes      int     `json:"ImdbVotes,omitempty"`
 	Language       string  `json:"Language,omitempty"`
 	Country        string  `json:"Country,omitempty"`
+	Rated          string  `json:"Rated,omitempty"`
 }