fix(release): trigger major release

This should be a major release: #262

BREAKING CHANGE: Upgrade to `@testing-library/dom` v9: https://github.com/testing-library/dom-testing-library/releases/tag/v9.0.0

Author: kentcdodds

other/manual-releases.md

@@ -41,4 +41,4 @@ change is to release a new patch version.
 Reference: #<the number of a relevant pull request, issue, or commit>
 ```
 
-The number of times we've had to do a manual release is: 2
+The number of times we've had to do a manual release is: 3