Ignore restricted_acton on channel join (slack). Closes #387

bridge/slack/slack.go

@@ -103,11 +103,15 @@ func (b *Bslack) JoinChannel(channel config.ChannelInfo) error {
 		}
 		_, err := b.sc.JoinChannel(channel.Name)
 		if err != nil {
-			if err.Error() != "name_taken" {
+			switch err.Error() {
+			case "name_taken", "restricted_action":
+			case "default":
+				{
 					return err
 				}
 			}
 		}
+	}
 	return nil
 }