Issue #7: Updated README.md with guide on how to use git-risk.
Issue #7: Followup that makes formatting changes only to README.md to make it more clear what was meant.
Issue #7: Escape single quotes so that git markdown doesn't accidentally think they are actually highlighting something.
Issue #7: Don't use bash encoding for code block, since it's not needed, and it's causing confusing single-quotation highlighting problems.