fix: add babel as dev dependency

Author: jeswr

package-lock.json

@@ -23,6 +23,7 @@
     "@types/jest": "^26.0.20",
     "@typescript-eslint/eslint-plugin": "^4.15.1",
     "@typescript-eslint/parser": "^4.15.1",
+    "babel": "^6.23.0",
     "eslint": "^6.8.0",
     "eslint-plugin-jest": "^23.8.1",
     "husky": "^4.2.3",