Vendor things

third-party/vendor/wasm-bindgen-futures/README.md

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+# `wasm-bindgen-futures`
+
+[API Documentation][docs]
+
+This crate bridges the gap between a Rust `Future` and a JavaScript
+`Promise`. It provides two conversions:
+
+1. From a JavaScript `Promise` into a Rust `Future`.
+2. From a Rust `Future` into a JavaScript `Promise`.
+
+Additionally under the feature flag `futures-core-03-stream` there is experimental 
+support for `AsyncIterator` to `Stream` conversion.
+
+See the [API documentation][docs] for more info.
+
+[docs]: https://rustwasm.github.io/wasm-bindgen/api/wasm_bindgen_futures/