Change is_int to is_numeric.

Lines of code: https://github.com/FoolCode/SphinxQL-Query-Builder/blob/master/src/Drivers/ConnectionBase.php#L107-L108

Change

```php
} elseif (is_int($value)) {
    return (int) $value;
}
```

to

```php
} elseif (is_numeric($value)) {
    return (int) $value;
}
```

Values like `"1"` `"2"` are not processed although they are numbers.