`.htmlhintrc` silently ignored if not valid JSON

[estrehle]

If the .htmlhintrc is not valid JSON, the linter silently ignores it and uses a default config.

For example, I had made the mistake of keeping a trailing comma:

{
    "attr-lowercase": false,
}

The default config has "attr-lowerclase": true and I received a lot of unwanted errors. It took me a while to figure out that the malformatted JSON was the culprit.

It would be helpful if the linter at least displayed a warning log message upon execution if it cannot parse the config file.

[marwinburesch]

I agree, for example the docs use single quotes in the examples, but it is only valid with double quotes

[stale[bot]]

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