2020/06/18: Concuerror integration has been added. It is
            currently minimal but usable. Experimentation
            and feedback is welcome.

2020/11/30: Support for publishing Hex releases and docs
            has been added. It is currently experimental.
            Feedback is more than welcome.

2022/03/25: The -Wrace_conditions Dialyzer flag was removed
            as it is no longer available starting from OTP 25.

2022/05/20: Relx has been updated to v4. Relx v4 is no longer
            an escript, therefore breaking changes were
            introduced. The `RELX`, `RELX_URL` and `RELX_OPTS`
            variables were removed. The `relx` project must
            be added as a `DEPS`, `BUILD_DEPS` or `REL_DEPS`
            dependency to enable building releases. For example:
            `REL_DEPS = relx`. Relx itself has had some
            additional changes: the `start` command has
            been replaced by `daemon`, and configuration
            defaults have changed so that you may need
            to add the following to your relx.config file:

            ``` erlang
            {dev_mode, false}.
            {include_erts, true}.
            ```
