Merge pull request #138 from AntoniBertel/v3

Added language_code field in User structure

chat.go

@@ -9,6 +9,7 @@ type User struct {
 	FirstName string `json:"first_name"`
 	LastName  string `json:"last_name"`
 	Username  string `json:"username"`
+	LanguageCode  string `json:"language_code"`
 }
 
 // Recipient returns user ID (see Recipient interface).