Bump to 3.24.0

bump to 3.23.0

Bump to 3.22.1

Bump to 3.22.0

Bump to 3.21.0

Rebar 3.20.0

This release took a while to build; OTP-25.1 had incompatibilites
with EUnit that interrupted the CI process, and which are corrected
in later releases.

New features:
- [Add --eval option to `shell`](erlang#2728)
- [Add support for `dialyzer --incremental` when available](erlang#2736)
- [Vendor structure](erlang#2720)

This new vendor structure should be of no impact to anyone using Rebar3
as a built artifact, but should make the life of corporate users and
package managers much easier by having pre-bundled in all dependencies
and allowing effective offline builds. It also simplifies our bootstrap
code and reduces security issues by not having to download a certificate
bundle _without_ certificates, at least until our oldest supported version
can use Erlang's new built-in on-host certificate lookup mechanisms.

If you do rely on Rebar3 source for your tooling or any other mechanisms,
then you will want to `cd apps/rebar` before running other commands.

Other fixes:

- [Warn of EUnit issues on OTP-25.1](erlang#2747)
- [Respect HEX_MIRROR environment variable](erlang#2748)
- [Use shell:start_interactive to start shell if available](erlang#2741)
- [Do not send empty If-None-Match in tarball request](erlang#2738)
- [Respect rebar_packages_cdn set in rebar.config](erlang#2737)
- [Dereference symbolic links when copying files from ct data folder](erlang#2731)
- [Reduce warnings around bootstrap and DAG operations](erlang#2732)

version 3.18.0

Release 3.17.0

security release