Before, our README said gojs `GOOS=js compiled wasm` was experimental.
However, as we head to 1.0 we should be more explicit about that.
When we started gojs, there was no likely future where `GOOS=wasi` would
happen in the standard go compiler. This has changed, so we'll only keep
the gojs package around until wasi is usable for two Go releases. Being
in an experimental package helps others know to watch out for this.
Signed-off-by: Adrian Cole <adrian@tetrate.io>