update demo

Author: dujiepeng

example/ios/Podfile.lock

@@ -1,9 +1,9 @@
 PODS:
   - Flutter (1.0.0)
-  - HyphenateChat (4.0.3)
+  - HyphenateChat (4.1.1)
   - im_flutter_sdk (0.0.1):
     - Flutter
-    - HyphenateChat (= 4.0.3)
+    - HyphenateChat (= 4.1.1)
 
 DEPENDENCIES:
   - Flutter (from `Flutter`)
@@ -21,8 +21,8 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   Flutter: f04841e97a9d0b0a8025694d0796dd46242b2854
-  HyphenateChat: 35826ebaa42ebac897b39e29a06f2215a060011a
-  im_flutter_sdk: bbcfbe596ef4682c9518604e1cb319e967f6b163
+  HyphenateChat: 95aa4abbad0e763f513acbe21ff9543f50b886cd
+  im_flutter_sdk: 9242a0d080c2f4ade4a0247a21b034036320233e
 
 PODFILE CHECKSUM: 7368163408c647b7eb699d0d788ba6718e18fb8d
 

example/lib/main.dart

@@ -1,10 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:im_flutter_sdk/im_flutter_sdk.dart';
 
-var appKey = "easemob-demo#flutter";
+var appKey = "";
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
+  assert(appKey.isNotEmpty, "appKey is empty");
   EMOptions options =
       EMOptions(appKey: appKey, autoLogin: false, debugModel: true);
   await EMClient.getInstance.init(options);
@@ -297,7 +298,7 @@ class _MyHomePageState extends State<MyHomePage> {
       content: _messageContent,
     );
 
-    EMClient.getInstance.chatManager.sendMessage(msg);
+    await EMClient.getInstance.chatManager.sendMessage(msg);
   }
 
   void _addLogToConsole(String log) {

example/pubspec.lock

@@ -97,7 +97,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "4.0.3"
+    version: "4.1.3"
   js:
     dependency: transitive
     description: