Add Description Url Entities

Author: penguinxr2

twitter_entities.go

@@ -10,7 +10,8 @@ type UrlEntity struct {
 }
 
 type Entities struct {
-	Hashtags []struct {
+	Description UrlEentity
+	Hashtags    []struct {
 		Indices []int
 		Text    string
 	}