chore(examples): remove babel-core dependency

Author: francoischalifour

examples/vanilla/package.json

@@ -11,7 +11,6 @@
     "medium-zoom": "1.0.6"
   },
   "devDependencies": {
-    "babel-core": "^6.26.3",
     "parcel-bundler": "1.12.4"
   }
 }