[sbt 1.0.0-M5] console task doesn't work 


## steps

Using 1.0.0-M5, Scala 2.12.2:

```
> console
```

## problem

```
> console
[error] (run-main-0) java.lang.NoClassDefFoundError: xsbti/ConsoleInterface
[error] (compile:console) Nonzero exit code: 1
```

## expectation

It works.

