Fix list formatting in README

[Scorpil]

If you check "Problems Hamilton Solves" section on current master you'll see that the list-like content is rendered on a single line. This PR fixes it.

Changes

Adding two trailing whitespaces to force newline break

Linter is not happy about trailing whitespaces (even though it's a valid Markdown feature), so I replaced them with <br/>

How I tested this

Preview

Notes

First PR where trailing whitespace is a solution and not a problem 😅

Nope, still a problem

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[elijahbenizzy]

Great, thanks! Alternatively, we could change the linting rules to allow trailng whitespace in markdown. That said, I think this is fine and looks quite nice.