docs: add MichaelDeBoey as a contributor (testing-library#293)

allcontributors[bot] · web-flow · commit 45e22a43987c · 2020-05-20T16:37:15.000-06:00
diff --git a/README.md b/README.md
@@ -400,7 +400,6 @@ Thanks goes to these people ([emoji key][emojis]):
 
 <!-- markdownlint-enable -->
 <!-- prettier-ignore-end -->
-
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors][all-contributors] specification.
