The limitation rate-limiting module pulls in a fork of kadence from a git master located at github.com/gwicke/kad.git. This fork hasn't been updated in a while and has begun throwing deprecation warnings on npm install:
npm WARN deprecated kad-memstore@0.0.1: Please upgrade to @kadenceproject/kadence - See https://kadence.github.io npm WARN deprecated kad-fs@0.0.4: Please upgrade to @kadenceproject/kadence - See https://kadence.github.io
This should be cleaned up and hopefully brought up to date.