Update README.md to fix code rendering

[jongalloway]

Markdown fix for the following:

Purpose

• Markdown fix for code block on README.md

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Documentation content changes
[ ] Other... Please describe:

How to Test

• N/A

What to Check

Verify that the following are valid

• Markdown renders correctly

Other Information