ml-agents/com.unity.ml-agents.extensions/package.json

{
  "name": "com.unity.ml-agents.extensions",
  "displayName": "ML Agents Extensions",
  "version": "0.4.0-preview",
  "unity": "2019.4",
  "description": "A source-only package for new features based on ML-Agents",
  "dependencies": {
    "com.unity.ml-agents": "2.0.0-pre.2",
    "com.unity.modules.physics": "1.0.0"
  }
}