message: fix swoole\channel->peek bugs
diff: @@ -137,7 +137,7 @@ static PHP_METHOD(swoole_channel, peek)
  RETURN_FALSE;
  }
  - swTask_type(&buf) = SW_TASK_PEEK;
  + swTask_type(&buf) |= SW_TASK_PEEK;
  zval *ret_data = php_swoole_task_unpack(&buf TSRMLS_CC);
  if (ret_data == NULL)
  {
  