Installation instruction for precompiled binaries no longer works

[dtolnay]

It's worked fine for >4 years, but starting today, the instructions provided here no longer work:

https://github.com/koute/cargo-web/tree/2ddd9bbb567b8d4893e923cba8ad03806d383d80#precompiled-binaries

The curl -L -s -H 'Accept: application/json' https://github.com/koute/cargo-web/releases/latest now returns HTML instead of JSON like it used to. (Maybe this is a short-lived GitHub bug?)

For GitHub Actions users: serde-rs/serde@adcb11c should work as a replacement.