Update dependency @babel/core to v7.9.0

Author: renovate-bot

package-lock.json

@@ -56,7 +56,7 @@
     "execa": "4.0.0"
   },
   "devDependencies": {
-    "@babel/core": "7.8.7",
+    "@babel/core": "7.9.0",
     "babel-plugin-istanbul": "6.0.0",
     "cypress": "4.1.0",
     "express": "4.17.1",