Incorrect ecmaVersion suggests only the old-style ES versions

Tell us about your environment

• ESLint Version: 3.8.1
• Node Version: 3.9.0
• npm Version: 3.10.8

What parser (default, Babel-ESLint, etc.) are you using? default

Please show your full configuration:

'use strict';

module.exports = {
    parserOptions: {
        ecmaVersion: 2018,
    },
};

What did you do? Please include the actual source code causing the issue.

eslint .

What did you expect to happen? An error message that would mention the 2015, 2016 & 2017 options.

What actually happened? Please include the actual, raw output from ESLint. It prints:

Parsing error: ecmaVersion must be 3, 5, 6, 7, or 8

[nzakas]

I actually don’t think we should be outputting the possible version numbers at all. It should be fine to just say “Invalid ecmaVersion”, otherwise we’ll be stuck updating that message every year.

And if this is coming from Espree, then it would have to be changed there, not here.

[sstern6]

@nzakas thanks!

Should have a PR open for this late today PST and will ref this issue when I do.