Update lerna

Author: chaance

package.json

@@ -30,8 +30,8 @@
     "husky": "^1.3.1",
     "jest": "^24.9.0",
     "jest-circus": "^24.9.0",
-    "lerna": "^3.13.4",
-    "lerna-changelog": "^0.8.2",
+    "lerna": "^4.0.0",
+    "lerna-changelog": "^2.1.0",
     "metro-react-native-babel-preset": "^0.56.0",
     "prettier": "^1.14.3",
     "pretty-quick": "^1.4.1",