fix: export for commonjs

[kearfy]

Description

Currently, commonjs projects will be hit with the following error:

/.../node_modules/unws/src/node.js:3
export { WebSocket }
^^^^^^

SyntaxError: Unexpected token 'export'

By replacing the export statement with module.export for the commonjs node.js fiel, I am quite positive that this PR should solve that issue.

I tested this on Node v16.16.0 & v18.14.2 with a commonjs and a module project and lastly with a nodejs (index.js) script and a typescript (index.ts) script via ts-node. All combinations of what I mentioned here.

Linked Issues

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Additional context

I need this change somewhat urgently for a library that I'm maintaining as two people are stuck on this issue as of now. I made the change from isomorphic-ws as it's barely maintained and had caused issues for importing into certain environments. Ironically, this library is now also causing issues though I can see how this library is better than isomorphic-ws 😛

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[sxzz]

Thanks for your PR. Merged!

[kearfy]

Thanks for your fast response @sxzz! Really appreciate it!