Bump version: v2.2.0a1

README.md

@@ -85,7 +85,7 @@ jobs:
       - uses: actions/setup-python@v2
 
       - name: Install cibuildwheel
-        run: python -m pip install cibuildwheel==2.1.2
+        run: python -m pip install cibuildwheel==2.2.0a1
 
       - name: Build wheels
         run: python -m cibuildwheel --output-dir wheelhouse
@@ -189,6 +189,18 @@ Changelog
 
 <!-- this section was generated by bin/update_readme_changelog.py -- do not edit manually -->
 
+### v2.2.0 (prerelease)
+
+_Currently in prerelease. The below release notes will be condensed into a single entry on final release._
+
+_v2.2.0a1 (23 September 2021)_
+
+- 🌟 Added support for [musllinux](https://www.python.org/dev/peps/pep-0656/). Support for this new wheel format lets projects build wheels for Linux distributions that use [musl libc](https://musl.libc.org/), notably, [Alpine](https://alpinelinux.org/) Docker containers.
+
+  Musllinux builds are enabled by default. To disable them on your project, add `*-musllinux_*` to your [`CIBW_SKIP`/`skip`](https://cibuildwheel.readthedocs.io/en/stable/options/#build-skip)
+ option. (#768)
+- 🛠 Setting an empty string for the [`CIBW_*_IMAGE`](https://cibuildwheel.readthedocs.io/en/stable/options/#manylinux-image) option will now fallthrough to the config file or cibuildwheel's default, rather than causing an error. This makes the option easier to use in CI build matricies. (#829)
+
 ### v2.1.2
 
 _14 September 2021_
@@ -225,12 +237,6 @@ _16 July 2021_
 - 🛠 Use the unified pypa/manylinux images to build PyPy (#671)
 - 🐛 Numerous bug fixes & docs improvements
 
-### v1.12.0
-
-_22 June 2021_
-
-- ✨ Adds support building macOS universal2/arm64 wheels on Python 3.8.
-
 <!-- END bin/update_readme_changelog.py -->
 
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