Add a new maintainer (Yours Truly) to README

[MrDoomBringer]

Adds myself to the readme.
This PR exists mostly as a dry-run for branching / opening a pull request / etc.

Checklist:

• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[apollo-cla]

@MrDoomBringer: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/