{
  "command": {
    "publish": {
      "allowBranch": "master"
    }
  },
  "npmClient": "yarn",
  "useWorkspaces": true,
  "registry": "https://registry.npmjs.org",
  "version": "4.0.0-rc.6"
}

{
  "command": {
    "publish": {
      "allowBranch": "release/4.0"
    }
  },
  "npmClient": "yarn",
  "useWorkspaces": true,
  "registry": "https://registry.npmjs.org",
  "version": "4.0.0-rc.6"
}

Set publish branch to 4.0
Set publish branch to 4.0
