rust: pin-init: Update Changelog and Readme

Add Changelog entry for the `Wrapper` trait and document the
`unsafe-pinned` feature in the Readme.

Signed-off-by: Christian Schrefl <chrisi.schrefl@gmail.com>
Link: Rust-for-Linux/pin-init@986555f
[ Fixed commit authorship. - Benno ]
Signed-off-by: Benno Lossin <benno.lossin@proton.me>

Author: onestacked

rust/pin-init/README.md

@@ -40,6 +40,12 @@ However, using the crate on stable compilers is possible by disabling `alloc`. I
 will require the `std` feature, because stable compilers have neither `Box` nor `Arc` in no-std
 mode.
 
+### Nightly needed for `unsafe-pinned` feature
+
+This feature enables the `Wrapper` implementation on the unstable `core::pin::UnsafePinned` type.
+This requires the [`unsafe_pinned` unstable feature](https://github.com/rust-lang/rust/issues/125735)
+and therefore a nightly compiler. Note that this feature is not enabled by default.
+
 ## Overview
 
 To initialize a `struct` with an in-place constructor you will need two things:

rust/pin-init/src/lib.rs

@@ -32,6 +32,12 @@
 //! will require the `std` feature, because stable compilers have neither `Box` nor `Arc` in no-std
 //! mode.
 //!
+//! ## Nightly needed for `unsafe-pinned` feature
+//!
+//! This feature enables the `Wrapper` implementation on the unstable `core::pin::UnsafePinned` type.
+//! This requires the [`unsafe_pinned` unstable feature](https://github.com/rust-lang/rust/issues/125735)
+//! and therefore a nightly compiler. Note that this feature is not enabled by default.
+//!
 //! # Overview
 //!
 //! To initialize a `struct` with an in-place constructor you will need two things: