Updating Docker Compose Reference in README

[phutelmyer]

Describe the change
Updating docker-compose to docker compose in README references as the syntax has changed. We will have to review for compatibility (perhaps just have both commands as options)

Describe testing procedures
None yet

Sample output
N/A

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of and tested my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings