Release 1.24.0

New version: 1.24.0.

Release 1.23.3

New version: 1.23.3.

Release 1.23.2

New version: 1.23.2.

Release 1.23.1

Updated files to support new Abseil on Windows.

Release 1.23.0

New version: 1.23.0:

- Added `RE2.Set` (thx, Wes).
- Updates and upgrades.
- More docs.

Release 1.22.3

New version: 1.22.3.

Release 1.22.2

Upgrade the MacOS Intel runner.

Release 1.22.1

Switched to good old C checks:

* Some compilers had problems with `starts_with()`.

Release 1.22.0

New version: 1.22.0.

Release 1.21.5

New version: 1.21.5.