clickhouse query error when using `with () as A select ` SQL.

clickhouse query support:

```
with 'a' as A
select a 
```

but when use `clickhouse` library because the line:
[query.match(/^(select|show|exists)/i)](https://github.com/TimonKK/clickhouse/blob/9dea3c0c3e4f3e2fe64e59dad762f1db044bf9bf/index.js#L479)