remove dark theme for now

example/lib/main.dart

@@ -98,7 +98,9 @@ class MyApp extends StatelessWidget {
     return MaterialApp(
       theme: ThemeData.light(),
       darkTheme: ThemeData.dark(),
-      themeMode: ThemeMode.system,
+      themeMode: ThemeMode.light,
+
+      ///TODO change to system once dark theme is implemented
       builder: (context, widget) {
         return StreamChat(
           child: widget,

example/pubspec.yaml

@@ -1,6 +1,6 @@
 name: example
 description: A new Flutter project.
-version: 1.0.40+42
+version: 1.0.41+43
 
 environment:
   sdk: ">=2.2.2 <3.0.0"