Cleanup README formatting

[bbriggs]

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've been mindful about doing atomic commits, adding documentation to my changes, not refactoring too much.
• I've a descriptive title and added any useful information for the reviewer. Where appropriate, I've attached a screenshot and/or screencast (gif preferably).
• I've written tests to cover the new code and functionality included in this PR.
• I've read, agree to, and signed the Contributor License Agreement (CLA).

PR Summary

Cleans up some minor formatting stuff in the readme

[CLAassistant]

All committers have signed the CLA.

[aoberoi]

@bbriggs looks great to me! would you mind signing the CLA?

[bbriggs]

I promise I did, but it doesn't seem to be going through. It was the google form, right?

[aoberoi]

at an earlier point, it was. we switched over to CLA assistant ~9 months ago, so we probably need your signature again (there was no way to import the google sheets data since we need github usernames now). would you mind signing again?

[bbriggs]

Okay, signed!