Merge pull request #6 from algorand/tsachi/properclose

flush the connection when writing control messages

conn.go

@@ -548,7 +548,12 @@ func (c *Conn) WriteControl(messageType int, data []byte, deadline time.Time) er
 	if messageType == CloseMessage {
 		c.writeFatal(ErrCloseSent)
 	}
-	return err
+
+	if err != nil {
+		return err
+	}
+
+	return c.flush()
 }
 
 // beginMessage prepares a connection and message writer for a new message.