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The last commit did a mv. I intended to do a cp.

Go modules has to support many OSs and filesystems,
so it completely ignores symlinks when creating module zips.
And parts of the Go ecosystem, like pkg.go.dev, consume those zips.

So this symlink actually makes the module technically non-OSS,
since it completely lacks a LICENSE file when downloaded.
pkg.go.dev thus refuses to show its documentation.

One option would be to rename the root LICENSE.md file to just LICENSE,
since cmd/go treats that file in a special way,
including it in subdirectory-module zips.
Unfortunately, we do want the ".md" extension,
since the file is formatted to outline the double license.

As such, simply copy the file. It should be fine as it's mostly static.

While at it, make v2's license a symlink, so the two stay in sync.
The reason we want the v2 module to have its own license is so that its
module zip includes the file as well.

Besides mentioning v0 and v2, the root README now also links to pkgsite
and lists Masih and myself as default maintainers, given that we're the
ones that did major work on this library last.

Fixes #124.
Fixes #179.

This will allow pkgsite to render the wip-v2 module.

This one should work with both github and godoc.