Update changelog and readme

Author: taiki-e

CHANGELOG.md

@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Distribute prebuilt binary for x86_64 illumos. ([#252](https://github.com/taiki-e/cargo-hack/pull/252), thanks @zeeshanlakhani)
+
 ## [0.6.28] - 2024-04-17
 
 - Fix bug in `--mutually-exclusive-features` option. ([#250](https://github.com/taiki-e/cargo-hack/issues/250))

README.md

@@ -466,7 +466,7 @@ cargo-hack requires Cargo 1.26+.
 ### From prebuilt binaries
 
 You can download prebuilt binaries from the [Release page](https://github.com/taiki-e/cargo-hack/releases).
-Prebuilt binaries are available for macOS, Linux (gnu and musl), Windows (static executable), and FreeBSD.
+Prebuilt binaries are available for macOS, Linux (gnu and musl), Windows (static executable), FreeBSD, and illumos.
 
 <details>
 <summary>Example of script to download cargo-hack</summary>