[ui] update cli-service package.json

[d62remi]

Version

3.0.0-rc.2

Reproduction link

https://user-images.githubusercontent.com/11924796/41468217-8064972a-70a9-11e8-8451-ad0b05183a71.png

Steps to reproduce

After update all plugins with cli ui, package.json don't update.

What is expected?

update of package.json devDependencies

What is actually happening?

vue/cli-service remains at the previous version

[Akryum]

Updating the package.json file is not useful since you now have either a package-lock.json or yarn.lock file which represent the actual versions you use in your project (this one should be updated).
The package.json file only contains wanted version ranges. 3.0.0-rc.2 is a valid version for ^3.0.0-rc.1 version range.

[d62remi]

Thank you for the precision