message: Update version to match current in app.json
diff: },
  "JHIPSTER_REGISTRY_VERSION": {
  "description": "Version of the registry to deploy.",
  - "value": "6.2.0"
  + "value": "6.4.0"
  }
  },
  "buildpacks": [{ "url": "heroku/jvm" }, { "url": "https://github.com/jhipster/jhipster-registry-buildpack" }]
  