Update dependency lerna to v2.9.0

Author: renovate-bot

packages/client/package.json

@@ -51,7 +51,7 @@
     "@types/jest": "20.0.8",
     "jest": "20.0.4",
     "jsonwebtoken": "7.4.3",
-    "lerna": "2.0.0-beta.32",
+    "lerna": "2.9.0",
     "localstorage-polyfill": "1.0.1",
     "regenerator-runtime": "0.9.6",
     "rimraf": "2.6.1"