Bump MSRV to 1.70

Author: taiki-e

Cargo.toml

@@ -6,7 +6,7 @@ name = "async-io"
 version = "2.5.0"
 authors = ["Stjepan Glavina <[email protected]>"]
 edition = "2021"
-rust-version = "1.63"
+rust-version = "1.70"
 description = "Async I/O and timers"
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/smol-rs/async-io"

src/lib.rs

@@ -1251,7 +1251,7 @@ unsafe impl IoSafe for std::process::ChildStderr {}
 #[cfg(unix)]
 unsafe impl IoSafe for std::os::unix::net::UnixStream {}
 
-// PipeReader & PipeWriter require std >= 1.87, our MSRV is 1.63, hence
+// PipeReader & PipeWriter require std >= 1.87, our MSRV is 1.70, hence
 // conditional on cfg()s, generated from build.rs
 #[cfg(not(async_io_no_pipe))]
 unsafe impl IoSafe for std::io::PipeReader {}