travis - update erlang 17 versions

[trollfred]

No description provided.

[tmcgilchrist]

Seems like this is needed before we'll get passing builds on the other PRs.
I'm wondering if it needs to include all 3 released versions of 17? Perhaps just the latest one is sufficient.

@jlouis

[jlouis]

I'm not really maintaining this project anymore. Garrett Smith has volunteered to carry the baton, so you would have to address him instead, and perhaps go looking at his fork. As for the 17.x releases, I think supporting 17.4 and 16B03 should be enough. Essentially, support the latest patch release of the previous version of Erlang, and support the current latest patch-release. But YMMV. For Emysql, it may make sense to support more versions. In any case, it isn't really my call to make.

[trollfred]

@gar1t what do you think of it?

[tmcgilchrist]

Apologies @jlouis I didn't see who actually took over maintaining this library in the erlang-questions mailing list. As I said I'd like to help out around here so I'll hit up @gar1t in future. Cheers.

[jlouis]

No problem. It was a recent development and only announced on the erlang-questions@ mailing list, so you couldn't possibly have known in any case. I just want to help out where possible with a maintenance transition.