Vendor dependencies for 0.3.0 release

vendor/futures-lite/README.md

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+# futures-lite
+
+[![Build](https://github.com/smol-rs/futures-lite/workflows/Build%20and%20test/badge.svg)](
+https://github.com/smol-rs/futures-lite/actions)
+[![License](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](
+https://github.com/smol-rs/futures-lite)
+[![Cargo](https://img.shields.io/crates/v/futures-lite.svg)](
+https://crates.io/crates/futures-lite)
+[![Documentation](https://docs.rs/futures-lite/badge.svg)](
+https://docs.rs/futures-lite)
+
+A lightweight async prelude.
+
+This crate is a subset of [futures] that compiles an order of magnitude faster, fixes minor
+warts in its API, fills in some obvious gaps, and removes almost all unsafe code from it.
+
+In short, this crate aims to be more enjoyable than [futures] but still fully compatible with
+it.
+
+The API for this crate is intentionally constrained. Please consult the 
+[features list] for APIs that are occluded from this crate.
+
+[futures]: https://docs.rs/futures
+[features list]: https://github.com/smol-rs/futures-lite/blob/master/FEATURES.md
+
+## Examples
+
+```rust
+use futures_lite::future;
+
+fn main() {
+    future::block_on(async {
+        println!("Hello world!");
+    })
+}
+```
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+#### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.