Proper SSL config for ACE

[Charles]

I have been seeing this error of recent from chrome(65): ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY.

I have been running the same self-cert without issues for a few months until recent.

For reference, testing curl -v -k https://41.79.64.38:3201/api/users/1 against the same ACE server gives no errors.

The following resorces might have some pointers to improving SSL security in general on ERLANG (and Pheonix). Maybe we can incorporate their findings into ACE?

https://elixirforum.com/t/making-ssl-tests-all-pass-for-phoenix-lets-encrypt/3507

http://ezgr.net/increasing-security-erlang-ssl-cowboy/

Regards.