message: build(all): added clean command to postinstall script
diff: "version": "1.0.0-rc.2",
  "description": "Reactive Node APIs made easy",
  "scripts": {
  - "postinstall": "yarn build && sleep 5s && yarn test",
  + "postinstall": "yarn clean && yarn build && sleep 5s && yarn test",
  "build": "lerna run build",
  "benchmark": "make -C benchmarks",
  "watch": "lerna run --parallel --stream watch",
  