Missing peerDependency for @webpack-contrib/schema-utils

[GuillaumeSpera]

Hello,

I just upgraded to Yarn 2 which ensures a strict dependency tree.
I have to fix the missing peerDependency from this package to be able to build.

react-docgen-typescript-loader@npm:3.7.2 [cfff4] doesn't provide webpack@^3.0.0 || ^4.0.0 requested by @webpack-contrib/schema-utils@npm:1.0.0-beta.0

It is something we'll have to get used to (having a clear definition and propagation of required dependencies).

I hope you'll be able to publish a fix for other users :)