Update README.md to include docker-compose run instructions

[gaylem]

Description

Updated README to modify instructions for running tests with docker-compose run instead of opening bash shell

Fixes #90

Testing Instructions

Review the README and make sure it aligns with the changes made in issue #90

Checklist:

• [x] My code follows the style guidelines of this project
• [] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

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[gaylem]

@derekeder made these changes in #90