Allow overriding parser option in .eslintrc

[protometa]

You can override linting defaults with a custom .eslintrc file but setting the parser field has no effect.

I'm getting typescript parse errors on prettier-standard --lint with valid typescript (possibly because this is using the deprecated babel-eslint parser, but that's another issue). It would be easy to mitigate by specifying parser: '@typescript-eslint/parser' in my .eslintrc, but that has no effect.