chore(deps): update dependency lerna to v4

Author: renovate-bot

package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "coveralls": "3.0.8",
     "del-cli": "3.0.0",
-    "lerna": "3.19.0",
+    "lerna": "4.0.0",
     "npm-run-all": "4.1.5",
     "nyc": "14.1.1",
     "replace": "1.1.1",