Prepare for releasing v0.9.0

.cargo/config.toml

@@ -1,3 +1,3 @@
 [build]
-rustflags = ["-Ctarget-cpu=haswell"]
-rustdocflags = ["-Ctarget-cpu=haswell"]
+rustflags = ["-Ctarget-cpu=native"]
+rustdocflags = ["-Ctarget-cpu=native"]

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 The ❗ icon indicates a breaking change.
 
+## v0.9.0 - 2021-02-20
+
+### Changed
+
+- ❗ Explicitly check the target CPU features during compilation. From this version, you need to specify `RUSTFLAGS='-C target-cpu=<CPU>'`, where `<CPU>` must be `haswell` or a newer microarchitecture; otherwise, build fails.
+
 ## v0.8.0 - 2020-11-24
 
 ### Added

README.md

@@ -15,7 +15,7 @@ A recent version of the nightly toolchain is required, since the [new `asm!` mac
 
 ### Target CPU
 
-Haswell or newer microarchitecture is required. You need to specify the target CPU by, for example, the [Cargo configuration file](https://doc.rust-lang.org/cargo/reference/config.html) in your crate (see [example](https://github.com/unageek/inari-graph/blob/master/.cargo/config.toml)).
+Haswell or newer microarchitecture is required. You need to specify the target CPU by, for example, the [Cargo configuration file](https://doc.rust-lang.org/cargo/reference/config.html) in your crate (see [example](https://github.com/unageek/inari-graph/blob/master/.cargo/config.toml); you may want to change `native` to `haswell` for maximum compatibility if you are planning to distribute the binary).
 
 ## Conditional features