Support updating package.json version

[P4sca1]

Hey there,

thank you for open-sourcing this project. It is very useful to me.
Would it be possible to add support for updating package.json files? Using markers does not work, because comments are invalid in JSON and the v prefix needs to be removed from the version.

[apricote]

Sounds like a good feature. The comments are quite limited, but all that I needed to get it working in the majority of my current active projects.

I already tried to make the "updaters" pluggable, so all it would need is a new updater and some way for the user to configure it. Could even start with a hardcoded /package.json. Here is how release-please makes this configurable.

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For now I am still working on the features that I personally need, so I will not get to this soon.