list spacing not compatible with linter-markdown

[Daniel-at-github]

I'm using linter-markdown and atom-tidy-markdown.

The only problem that I found is that atom-tidy-markdown puts lists in this format:

## Title

- list item

Then linter-markdown warns against it:

Warning	remark-lint	Incorrect list-item indent: add 2 spaces (remark-lint:list-item-indent)	20:3

and linter-markdown say it's good in this format:

## Requirements

-   list item

The recommended lints presets "that prevent mistakes or syntaxes that do not work correctly across vendors" are here: https://github.com/wooorm/remark-lint/tree/master/packages/remark-preset-lint-recommended