Feature request: Update to specific date

[BBaysinger]

• [x ] I have read the list of known issues before filing this issue.
• [x ] I have searched for similiar issues before filing this issue.

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I would think it would be very useful to have a feature that allows passing in a date, to have NCU update all dependencies to the latest versions as of the date specified. Of course I'm not sure if this is possible, as I don't know if the NPM repositories include such information.

My use case is relevant for today where I have an Angular 5 project, but have found Angular 6 was released within the last few days. Angular 6 breaks my project, and I'm not ready to migrate. I would like NCU to behave as if it was some date last week, so I can update everything to the latest versions from then, and try to get the last versions before this current major version. This is particularly important for me now, because I have two projects that I need to merge. I want to update them both to the same versions, and test before I merge, but updating them to todays current version is not an option.

I didn't see a similar feature in the documentation, so please let me know if this is already a feature.

Thanks for developing this tool. We use it a lot here, and don't know what we would do without it.

[raineorshine]

Thanks for the suggestion! I am going to mark this as an enhancement and invite the community to contribute. I have been unable to contribute directly to ncu in a while. Glad you are enjoying the tool!

[raineorshine]

Closed with the revive-me tag for interested contributors. See #484.