Use browser compatible version of stream

[jeswr]

Since this package is a dependency for rdf-object, if one wants to use rdf-object in a web app, then a polyfill needs to be used for the stream package.

As of webpack 5, node packages are not polyfilled automatically; so frontend developers now have to manually add this polyfilling. IMO it would be preferable to use a package like this

[rubensworks]

I understand the problem (I've ran into it many times myself before as well), but I'm not convinced yet that not depending on standard Node APIs is a good solution to the problem.

Recently, N3.js switched to using readable-stream, which solved the Webpack problem, but introduced new problems in Rollup.

So as it stands now, I'm more inclined to keep things as-is, as all tools seem to be able to handle Node APIs (with manual polyfilling). But I'm definitely open to changing things if you (or anyone else) think there's a definite solution that works for everyone.

(If I make this change, I'll probably immediately apply it in all my other libs as well)