Prerelease workflow

[shaohaolin]

Hi there, what the prerelease workflow looks like using beachball? When I do beachball change, it doesn't have a prerelease as a type. Is this intentional?

Currently, what I am doing is:

1. beachball change
2. fill up the questions
3. override the type field to prerelease in the generated json file.
4. beachball bump
5. beachball publish

Would be nice if the repo can include a prerelease session similar to what changesets has.