sbt -v -Xmx1G should work

## steps

```bash
sbt -v -Xmx1G 
```

## problem

```
[info] set current project to hello (in build file:/private/tmp/hello/)
[error] Expected ';'
[error] -Xmx1G
[error]       ^
```

## expectation

`-X` should be treated as a JVM parameter, similar to what's acceptable in `SBT_OPTS`
