chore(deps-dev): bump lerna from 3.18.3 to 3.20.2 (#755)

Author: dependabot-preview[bot]

package.json

@@ -44,7 +44,7 @@
     "husky": "^3.0.0",
     "jest": "^24.7.1",
     "jmespath": "^0.15.0",
-    "lerna": "3.18.3",
+    "lerna": "3.20.2",
     "lint-staged": "^9.0.0",
     "prettier": "1.19.1",
     "typescript": "^3.7.0",