New Flutter hompage is https://flutter.dev instead

Author: trietbui85

topics/flutter/index.md

@@ -6,7 +6,7 @@ logo: flutter.png
 related: dart, flutter-plugin, flutter-apps
 released: May 2017
 short_description: Flutter is an open source mobile application development SDK created by Google.
-url: https://flutter.io/
+url: https://flutter.dev/
 wikipedia_url: https://en.wikipedia.org/wiki/Flutter_(software)
 ---
 Flutter is an open source mobile application development SDK created by Google. It is used to develop applications for Android and iOS, as well as being the primary method of creating applications for Google Fuchsia.