update pubspec and changelogs

packages/stream_chat_flutter/example/lib/main.dart

@@ -87,7 +87,8 @@ class MyApp extends StatelessWidget {
 
 /// A list of messages sent in the current channel.
 ///
-/// This is implemented using [StreamMessageListView], a widget that provides query
+/// This is implemented using [StreamMessageListView], 
+/// a widget that provides query
 /// functionalities fetching the messages from the api and showing them in a
 /// listView.
 class ChannelPage extends StatelessWidget {

packages/stream_chat_flutter/example/lib/tutorial_part_1.dart

@@ -27,7 +27,8 @@ import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 /// - We make [StreamChat] the root Widget of our application
 ///
 /// - We create a single [ChannelPage] widget under [StreamChat] with three
-/// widgets: [StreamChannelHeader], [StreamMessageListView] and [StreamMessageInput]
+/// widgets: [StreamChannelHeader], [StreamMessageListView] 
+/// and [StreamMessageInput]
 ///
 /// If you now run the simulator you will see a single channel UI.
 void main() async {

packages/stream_chat_flutter/example/lib/tutorial_part_2.dart

@@ -25,7 +25,8 @@ import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 /// The [ChannelListPage] widget retrieves the list of channels based on a
 /// custom query and ordering. In this case we are showing the list of
 /// channels in which the current user is a member and we order them based
-/// on the time they had a new message. [StreamChannelListView] handles pagination
+/// on the time they had a new message. 
+/// [StreamChannelListView] handles pagination
 /// and updates automatically when new channels are created or when a new
 /// message is added to a channel.
 void main() async {

packages/stream_chat_flutter/example/lib/tutorial_part_3.dart

@@ -15,9 +15,10 @@ import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 /// We start by changing how channel previews are shown in the channel list
 /// and include the number of unread messages for each.
 ///
-/// We're passing a custom widget to [StreamChannelListView.channelPreviewBuilder];
-/// this will override the default [StreamChannelPreview] and allows you to create
-/// one yourself.
+/// We're passing a custom widget
+/// to [StreamChannelListView.channelPreviewBuilder];
+/// this will override the default [StreamChannelPreview] and allows you
+/// to create one yourself.
 ///
 /// There are a couple interesting things we do in this widget:
 ///

packages/stream_chat_flutter/example/lib/tutorial_part_4.dart

@@ -8,8 +8,10 @@ import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 /// to create sub-conversations inside the same channel.
 ///
 /// Using threaded conversations is very simple and mostly a matter of
-/// plugging the [StreamMessageListView] to another widget that renders the widget.
-/// To make this simple, such a widget only needs to build [StreamMessageListView]
+/// plugging the [StreamMessageListView]
+/// to another widget that renders the widget.
+/// To make this simple, such a widget only needs
+/// to build [StreamMessageListView]
 /// with the parent attribute set to the thread’s root message.
 ///
 /// Now we can open threads and create new ones as well. If you long-press a