chore: change babel-core to bridge version

Author: mdbetancourt

package.json

@@ -35,7 +35,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.1.6",
-    "babel-core": "6.26.3",
+    "babel-core": "7.0.0-bridge.0",
     "@babel/runtime": "^7.1.5",
     "@babel/plugin-transform-runtime": "^7.1.0",
     "@babel/preset-env": "^7.1.6",