chore(deps): update dependency @babel/core to v7.6.4

Author: renovate-bot

package-lock.json

@@ -48,7 +48,7 @@
     "debug": "4.1.1"
   },
   "devDependencies": {
-    "@babel/core": "7.6.2",
+    "@babel/core": "7.6.4",
     "babel-plugin-istanbul": "5.2.0",
     "cypress": "3.4.1",
     "istanbul-lib-coverage": "2.0.5",