added add, delete group recipients.

channel.go

@@ -193,7 +193,7 @@ func (c Channel) SetPermissions(role_id string, permissions uint) error {
 }
 
 // Fetch all of the members from group.
-// This function is should only for GroupChannel.
+// This function is only for GroupChannel.
 func (c Channel) FetchGroupMembers() ([]*User, error) {
 	var groupMembers []*User
 
@@ -206,3 +206,17 @@ func (c Channel) FetchGroupMembers() ([]*User, error) {
 	err = json.Unmarshal(resp, &groupMembers)
 	return groupMembers, err
 }
+
+// Add a new group recipient.
+// This function is only for GroupChannel.
+func (c Channel) AddGroupRecipient(user_id string) error {
+	_, err := c.Client.Request("PUT", "/channels/"+c.Id+"/recipients/"+user_id, []byte{})
+	return err
+}
+
+// Delete a group recipient.
+// This function is only for GroupChannel.
+func (c Channel) DeleteGroupRecipient(user_id string) error {
+	_, err := c.Client.Request("DELETE", "/channels/"+c.Id+"/recipients/"+user_id, []byte{})
+	return err
+}