update flutter_sms to the latest version

packages/flutter_sms/lib/flutter_sms.dart

@@ -1,32 +1,38 @@
 import 'dart:async';
 
-import 'src/flutter_sms_platform.dart';
+import 'src/flutter_sms_io.dart'
+    if (dart.library.js_interop) 'src/flutter_sms_web.dart';
+
+final FlutterSms _flutterSms = FlutterSms();
 
 /// Open SMS Dialog on iOS/Android/Web
 Future<String> sendSMS({
   required String message,
   required List<String> recipients,
-  bool sendDirect = false,
-}) =>
-    FlutterSmsPlatform.instance.sendSMS(
-      message: message,
-      recipients: recipients,
-      sendDirect: sendDirect,
-    );
+}) {
+  return _flutterSms.sendSMS(
+    message: message,
+    recipients: recipients,
+  );
+}
 
 /// Launch SMS Url Scheme on all platforms
 Future<bool> launchSms({
   String? message,
   String? number,
-}) =>
-    FlutterSmsPlatform.instance.launchSms(number, message);
+}) {
+  return _flutterSms.launchSms(number, message);
+}
 
 /// Launch SMS Url Scheme on all platforms
 Future<bool> launchSmsMulti({
   required String message,
   required List<String> numbers,
-}) =>
-    FlutterSmsPlatform.instance.launchSmsMulti(numbers, message);
+}) {
+  return _flutterSms.launchSmsMulti(numbers, message);
+}
 
 /// Check if you can send SMS on this platform
-Future<bool> canSendSMS() => FlutterSmsPlatform.instance.canSendSMS();
+Future<bool> canSendSMS() {
+  return _flutterSms.canSendSMS();
+}