chore(deps): update dependency lerna to v8

Author: renovate[bot]

package.json

@@ -30,7 +30,7 @@
     "eslint-plugin-prettier": "^3.1.0",
     "husky": "^3.0.3",
     "jest": "^24.8.0",
-    "lerna": "^3.16.4",
+    "lerna": "^8.0.0",
     "lerna-changelog": "^0.8.2",
     "lint-staged": "^9.2.1",
     "prettier": "^1.18.2",