git: openjdk/jdk-sandbox: classfile-api-dev-branch: Update README.md

[duke]

Changeset: 633f45b1
Author:    Adam Sotona <asotona at users.noreply.github.com>
Committer: GitHub <noreply at github.com>
Date:      2022-07-07 17:18:43 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/633f45b1a444f5a60d788e64711e171fe719008d

Update README.md

! README.md