[flutter_local_notifications] updated readme to add guidance on addin…

…g timezone as a direct dependency (#1743)

* updated readme to add guidance on adding timezone as a direct dependency

* add changelog entry around linux plugin dependency

flutter_local_notifications/CHANGELOG.md

@@ -1,3 +1,8 @@
+# [12.0.1+1]
+
+* Updated readme to indicate that the `timezone` package should be added as a direct dependency according to [this official lint rule](https://dart-lang.github.io/linter/lints/depend_on_referenced_packages.html)
+* Bumped dependency constraints on `flutter_local_notification_linux` that was meant to be done in 12.0.0
+
 # [12.0.1]
 
 * [Android][iOS] fixed issue [1721](https://github.com/MaikuB/flutter_local_notifications/issues/1721) where a crash occurs upon tapping on a notification action fbut the `onDidReceiveBackgroundNotificationResponse` optional callback hasn't been specified. 

flutter_local_notifications/README.md

@@ -628,9 +628,9 @@ The details specific to the Android platform are also specified. This includes t
 
 ### Scheduling a notification
 
-Starting in version 2.0 of the plugin, scheduling notifications now requires developers to specify a date and time relative to a specific time zone. This is to solve issues with daylight saving time that existed in the `schedule` method that is now deprecated. A new `zonedSchedule` method is provided that expects an instance `TZDateTime` class provided by the [`timezone`](https://pub.dev/packages/timezone) package. As the `flutter_local_notifications` plugin already depends on the `timezone` package, it's not necessary for developers to add the `timezone` package as a direct dependency. In other words, the `timezone` package will be a transitive dependency after you add the `flutter_local_notifications` plugin as a dependency in your application.
+Starting in version 2.0 of the plugin, scheduling notifications now requires developers to specify a date and time relative to a specific time zone. This is to solve issues with daylight saving time that existed in the `schedule` method that is now deprecated. A new `zonedSchedule` method is provided that expects an instance `TZDateTime` class provided by the [`timezone`](https://pub.dev/packages/timezone) package. Even though the `timezone` package is be a transitive dependency via this plugin, it is recommended based on [this lint rule](https://dart-lang.github.io/linter/lints/depend_on_referenced_packages.html) that you also add the `timezone` package as a direct dependency. 
 
-Usage of the `timezone` package requires initialisation that is covered in the package's readme. For convenience the following are code snippets used by the example app.
+Once the depdendency as been added, usage of the `timezone` package requires initialisation that is covered in the package's readme. For convenience the following are code snippets used by the example app.
 
 Import the `timezone` package
 

flutter_local_notifications/pubspec.yaml

@@ -2,7 +2,7 @@ name: flutter_local_notifications
 description: A cross platform plugin for displaying and scheduling local
   notifications for Flutter applications with the ability to customise for each
   platform.
-version: 12.0.1
+version: 12.0.1+1
 homepage: https://github.com/MaikuB/flutter_local_notifications/tree/master/flutter_local_notifications
 issue_tracker: https://github.com/MaikuB/flutter_local_notifications/issues