`npm link xrpl` doesn't work properly

[mvadari]

Reproduction:

• Run npm i -g xrpl
• Then try running a script with const xrpl = require("xrpl")
• It fails with a MODULE_NOT_FOUND error
• Try then running npm link xrpl to link the global module in locally
• You get the following error:

npm error code 127
npm error path /usr/local/lib/node_modules/xrpl
npm error command failed
npm error command sh -c copyfiles ../../README.md xrpl/README.md
npm error sh: 1: copyfiles: not found

I believe this is because the prepare script is running - that line was added here: https://github.com/XRPLF/xrpl.js/pull/2530