[google_maps_flutter_web]: Update installation instructions (#4163)

Author: domesticmouse

packages/google_maps_flutter/google_maps_flutter_web/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.0+3
+
+* Update the `README.md` usage instructions to not be tied to explicit package versions.
+
 ## 0.3.0+2
 
 * Document `liteModeEnabled` is not available on the web. [#83737](https://github.com/flutter/flutter/issues/83737).

packages/google_maps_flutter/google_maps_flutter_web/README.md

@@ -6,13 +6,8 @@ This is an implementation of the [google_maps_flutter](https://pub.dev/packages/
 
 ### Depend on the package
 
-This package is not an endorsed implementation of the google_maps_flutter plugin yet, so you'll need to modify the `pubspec.yaml` file of your app to depend on this package:
-
-```yaml
-dependencies:
-  google_maps_flutter: ^0.5.28
-  google_maps_flutter_web: ^0.1.0
-```
+This package is not an endorsed implementation of the google_maps_flutter plugin yet, so you'll need to 
+[add it explicitly](https://pub.dev/packages/google_maps_flutter_web/install).
 
 ### Modify web/index.html
 

packages/google_maps_flutter/google_maps_flutter_web/pubspec.yaml

@@ -2,7 +2,7 @@ name: google_maps_flutter_web
 description: Web platform implementation of google_maps_flutter
 repository: https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter/google_maps_flutter_web
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+maps%22
-version: 0.3.0+2
+version: 0.3.0+3
 
 environment:
   sdk: ">=2.12.0 <3.0.0"