make class-validator a peer dependency

[sincraianul]

closes #384

It makes sense to have class-validator as a peer dependency since routing-controllers is not really relying on it to provide certain standalone functionalities, but rather executes code from class-validator on the developer's part.

[matthewlilley]

It would be appreciated if you can accept this PR, or make a commit to achieve this yourselves. This causes problems when using class validator in other areas of an application.

[sincraianul]

@matthewlilley FIY I've transitioned to NestJS in the meantime, as this repo doesn't seem to be actively supported.

[matthewlilley]

@sincraianul Thanks for that. NestJS looks impressive, and resembles a popular PHP rad framework. That's something I believe the JS eco-system has been desperately needing for some time.

This wasn't a blocker for me, I just rolled back to the same version of class validator as this package is using, however, it would be nice to not be locked into using this version.

[jotamorais]

Fixed and merged through #512

[github-actions]

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