Detect config file mishaps

[novemberborn]

#192 adds support for ava.config.js files. There are possible bad configurations where AVA itself will refuse to run tests, that are ignored by this ESLint plugin.

It'd be good (if possible?) to have a lint rule that checks for those problems so we can issue a warning (or error).

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[sindresorhus]

What kind of bad configurations? Invalid options?

[novemberborn]

Config in package.json#ava with an ava.config.js present, or the latter file exporting bad values.

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[novemberborn]

We should add a standardized way of communicating these errors to https://github.com/avajs/ava/blob/master/eslint-plugin-helper.js, and then surface them in this plugin.