Clearly specify the minimum requirement for OTP26

[jozuas]

Description

There is no communication in this project on the fact that a minimum Erlang OTP version 26 is required.

** (exit) an exception was raised:
    ** (UndefinedFunctionError) function :base64.encode/2 is undefined or private

base64.encode/2 was introduced in OTP 26

versions:

• oidc: 3.1.0
• Elixir 1.15.7 with Erlang 25.3.2.7

[maennchen]

The version is specified for rebar:

oidcc/rebar.config

Line 3 in 6d28af8

{minimum_otp_vsn, "26"}.

Unfortunately, mix does not have a field to do the same thing.

[jozuas]

Thanks a lot for your quick response. I've bumped the discussion on this topic on the elixir forum https://elixirforum.com/t/specifying-minimal-erlang-version-in-mix-exs/39911/13?u=jozuas.

For the time being maybe having a visible section in the README.md on how "OTP26 or above is required" would ensure a smoother experience for Elixir users?

[maennchen]

@jozuas A PR for the README would be welcome 👍

Would you provide one?

If yes: make sure the section looks good both on GitHub and also in the docs since the README is included there as well.

[jozuas]

Sure, I will do later today.