chore(package): update @babel/core to version 7.5.4

Closes #1130

Author: greenkeeper[bot]

package.json

@@ -66,7 +66,7 @@
     "react-router-dom": "5.0.1"
   },
   "devDependencies": {
-    "@babel/core": "7.5.0",
+    "@babel/core": "7.5.4",
     "@babel/plugin-proposal-decorators": "7.4.4",
     "@babel/plugin-transform-regenerator": "7.4.5",
     "@babel/plugin-transform-runtime": "7.5.0",