Support async formatters #174
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Some formatters return promises, such as eslint-formatter-todo, which grunt-eslint doesn't currently handle.
See https://github.com/lint-todo/eslint-formatter-todo/blob/main/src/formatter.ts#L101
Instead of formatting grunt-eslint gives this:
I think simply making the format call async will properly handle this. I've tried it with both sync and async formatters and seems to work as expected.