[google_maps_flutter] [Docs] Note regarding usage within a bounded & an unbound widget (#3691)

Adds a note for the usage of GoogleMaps widget within unbounded & bounded widget.

Fixes: flutter/flutter#39234

Author: piedcipher

packages/google_maps_flutter/google_maps_flutter/CHANGELOG.md

@@ -1,6 +1,7 @@
-## NEXT
+## 2.2.6
 
 * Aligns Dart and Flutter SDK constraints.
+* Updates README.md to specify not to use GoogleMaps widget within an unbounded widget.
 
 ## 2.2.5
 

packages/google_maps_flutter/google_maps_flutter/README.md

@@ -105,6 +105,9 @@ You can now add a `GoogleMap` widget to your widget tree.
 The map view can be controlled with the `GoogleMapController` that is passed to
 the `GoogleMap`'s `onMapCreated` callback.
 
+The `GoogleMap` widget should be used within a widget with a bounded size. Using it
+in an unbounded widget will cause the application to throw a Flutter exception.
+
 ### Sample Usage
 
 <?code-excerpt "readme_sample.dart (MapSample)"?>

packages/google_maps_flutter/google_maps_flutter/pubspec.yaml

@@ -2,7 +2,7 @@ name: google_maps_flutter
 description: A Flutter plugin for integrating Google Maps in iOS and Android applications.
 repository: https://github.com/flutter/packages/tree/main/packages/google_maps_flutter/google_maps_flutter
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+maps%22
-version: 2.2.5
+version: 2.2.6
 
 environment:
   sdk: ">=2.17.0 <4.0.0"