Update CHANGELOG.md and README.md. Tag v0.3.0.

Author: cr1901

CHANGELOG.md

@@ -7,14 +7,23 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [v0.3.0] - 2022-01-25
+
 ### Changed
-- Bumped `bare-metal` to version `1.0.0`.
+- Bumped `bare-metal` to version `1.0.0`. Using bare_metal v1.x causes
+incompatible type errors with device crates (PACs) using bare-metal v0.2.x.
+This, _among other removed features_, requires a major version bump to fix.
+- All uses of the `llvm_asm!` macro have been replaced with `asm!`, in
+accordance with [Issue 92816](https://github.com/rust-lang/rust/pull/92816).
 
 ### Removed
 - `enable_cs` removed due to soundness hole when interacting with `Clone` and
   `interrupt::free`.
 - Remove `peripherals` module since the peripheral API is no longer provided by
   `bare-metal`.
+- `register::{sp, pc}::write` have been removed; inline assembly [mandates](https://doc.rust-lang.org/nightly/reference/inline-assembly.html#rules-for-inline-assembly)
+  that the stack pointer is restored before leaving an asm block. Writing
+  PC is also being removed as a precaution.
 
 ## [v0.2.2] - 2020-04-23
 
@@ -50,7 +59,8 @@ Initial release.
 
 [bare-metal]: https://github.com/japaric/bare-metal
 
-[Unreleased]: https://github.com/rust-embedded/msp430/compare/v0.2.2...HEAD
+[Unreleased]: https://github.com/rust-embedded/msp430/compare/v0.3.0...HEAD
+[v0.3.0]: https://github.com/rust-embedded/msp430/compare/v0.2.2...v0.3.0
 [v0.2.2]: https://github.com/rust-embedded/msp430/compare/v0.2.1...v0.2.2
 [v0.2.1]: https://github.com/rust-embedded/msp430/compare/v0.2.0...v0.2.1
 [v0.2.0]: https://github.com/rust-embedded/msp430/compare/v0.1.0...v0.2.0

README.md

@@ -7,10 +7,15 @@
 
 This crate is based on [cortex-m](https://docs.rs/cortex-m) crate by Jorge Aparicio (@japaric).
 
-**This crate requires a nightly rust due to the use of the `llvm_asm!`
-(`0.2.2` and above) or `asm!` (`0.2.1` and below) macro.** For `0.2.2`,
-`nightly-2020-04-22` is known to work. For `0.2.1`, `nightly-2020-01-04` is
-known to work.
+**This crate requires a nightly rust due to the use of the new `asm!` (`0.3.0`
+and above), `llvm_asm!` (`0.2.2`) or old `asm!` (`0.2.1` and below) macros.**
+The below table contains compilers which are known to work:
+
+|`msp430` version|`rustc` compiler    |
+|----------------|--------------------|
+|`0.3.0`         |`nightly-2022-01-24`|
+|`0.2.2`         |`nightly-2020-04-22`|
+|`0.2.1`         |`nightly-2020-01-04`|
 
 ## [Documentation](https://docs.rs/crate/msp430)