add typing indicator widget in example messagelist

pubspec.yaml

@@ -4,18 +4,18 @@ description: Stream Chat official Flutter SDK. Build your own chat experience us
 version: 0.1.8
 
 environment:
-  sdk: ">=2.2.2 <3.0.0"
+  sdk: ">=2.3.0 <3.0.0"
 
 dependencies:
   flutter:
     sdk: flutter
   rxdart: ^0.23.1
-  flutter_widgets: ^0.1.10
+  flutter_widgets: ^0.1.11
   jiffy: ^3.0.0
   cached_network_image: ^2.0.0
-  flutter_markdown: ^0.3.3
-  url_launcher: ^5.4.1
-  video_player: ^0.10.7
+  flutter_markdown: ^0.3.4
+  url_launcher: ^5.4.2
+  video_player: ^0.10.8+1
   chewie: ^0.9.8+1
   file_picker: ^1.4.3+2
   image_picker: ^0.6.3+4
@@ -23,4 +23,4 @@ dependencies:
   stream_chat: ^0.1.17
 
 dev_dependencies:
-  pedantic: ^1.8.0+1
+  pedantic: ^1.9.0