update ios notifications example

example/ios/Podfile

@@ -1,5 +1,5 @@
 # Uncomment this line to define a global platform for your project
-# platform :ios, '9.0'
+platform :ios, '11.0'
 
 # CocoaPods analytics sends network stats synchronously affecting flutter build latency.
 ENV['COCOAPODS_DISABLE_STATS'] = 'true'
@@ -63,6 +63,7 @@ target 'Runner' do
 
   # Keep pod path relative so it can be checked into Podfile.lock.
   pod 'Flutter', :path => 'Flutter'
+  pod 'StreamChatCore'
 
   # Plugin Pods