Release 0.23.0

Released 2021-12-10.
Progress: 3849 of 6444 tests passed in dart-sass compatibility mode
(this may seem like a regression, but that is caused by changed in the
test suite).

### Breaking changes

* `Error` has a new alternative, `AtError`.
* In `sass::Item`, the `Error`, `MixinCall` and `MixinDeclaration`
  variants is changed to include a `SourcePos`.  Also, a `sass::Mixin`
  contains a `SourcePos` for where it is declared.
* The fields of `SourcePos` is now private.
* The `name` of a `sass::Item::AtRule` is now a SassString.
* A `css::Value::Literal` now contains a `CssString` rather than a
  `String` and a `Quotes`.  Evaluating a `SassString` also returns a
  `CssString` (PR #118).
* The selector types are split from one `selector` module to the `css`
  and `sass` modules.  Anything that used `selector` types should now
  use either `css` or `sass` types (PR #123).

### Improvements

* A css call is just a special kind of string.
* Include position of directive or function call when reporting
  `@error` errors.
* Improve error reporting from inside mixins and functions.
* Support interpolation in `@`-rule names.
* Fixed #116: The `sass:map.merge` function was buggy.
* Fixed #119: `saturate(200%)` is allowed (the argument is not limited
  to 0..100%).
* `sass:selector` functions `append`, `nest`, and `parse` are closer
  to correct (PR #123).
* `sass:meta` functions `calc-args` and `calc-name` implemented (PR #126).
* Css strings and selectors can now be parsed directly (PR #123).
* Fixed reformatting of to-much-indented comments.
* Fixed panics in some color arithmetic (Issue #120, #121, #122, PR #125).
* Replace rand with fastrand, hopefully compile faster (PR #105).
* Unicode Private-use characters are escaped when printed.
* Updated `nom` to 7.0 and `nom-locate` to 4.0.
* Update sass-spec test suite to 2021-11-30.

Thanks to @paolobarbolini, @connorskees and @charlesxsh for reporting
issues.

CHANGELOG.md

@@ -7,7 +7,12 @@ The format is based on
 project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Unreleased
+## Release 0.23.0
+
+Released 2021-12-10.
+Progress: 3849 of 6444 tests passed in dart-sass compatibility mode
+(this may seem like a regression, but that is caused by changed in the
+test suite).
 
 ### Breaking changes
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rsass"
-version = "0.22.3-PRE"
+version = "0.23.0"
 authors = ["Rasmus Kaj <kaj@kth.se>"]
 categories = ["command-line-utilities", "web-programming"]
 keywords = ["scss", "sass", "css"]