fix: update Babel in upload-file-via-browser example (#968) (#970)

Author: autonome

Diff for: examples/upload-file-via-browser/package.json

@@ -11,8 +11,7 @@
   ],
   "license": "MIT",
   "devDependencies": {
-    "babel-core": "~6.26.3",
-    "babel-loader": "~8.0.4",
+    "@babel/core": "^7.4.3",
     "ipfs-http-client": "../../",
     "pull-file-reader": "~1.0.2",
     "react": "~16.6.3",