message: load endpoint depending on build mode
diff: import 'package:flutter/material.dart';
  import 'package:flutter_dotenv/flutter_dotenv.dart';
  import 'package:http/http.dart' as http;
  +import 'package:flutter/foundation.dart';
  Future main() async {
  await dotenv.load(fileName: ".env");
  @@ -16,7 +17,7 @@ class MyApp extends StatefulWidget {
  class _MyAppState extends State<MyApp> {
  update() async {
  - Uri uri = Uri.parse(dotenv.env['API_URL']!);
  + Uri uri = kReleaseMode ? Uri.parse(dotenv.env['PROD_API_URL']!) : Uri.parse(dotenv.env['DEV_API_URL']!);
  var result = await http.post(uri);
  print(result.body);
  setState(() {
  