Don't upgrade from non-prelease to prerelease from `latest` dist-tag by default

I've seen too many accidential publishes where alpha/beta is published on `latest` dist-tag, I think it's time to change the default behaviour to reject such versions by default:

```
NAME OLD   NEW        AGE     INFO
diff 5.2.0 6.0.0-beta 30 mins https://github.com/kpdecker/jsdiff
```