Declares Android Firebase Messaging dependency as api to allow it to be accessed from the app

An app shouldn’t have to define the the Firebase Messaging dependency in order to access it, as it’s already included within this plugin. By declaring it as an `api` dependency, this allows the app to access it and removes an extra step from the setup.

Author: josh-burton

packages/firebase_messaging/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 6.0.15
+
+* Declares Android Firebase Messaging dependency as `api` to allow it to be accessed from the app, and updates documentation.
+
 ## 6.0.14
 
 * Fix for missing UserAgent.h compilation failures.

packages/firebase_messaging/README.md

@@ -61,18 +61,6 @@ for more.
 
 By default background messaging is not enabled. To handle messages in the background:
 
-1. Add the `com.google.firebase:firebase-messaging` dependency in your app-level `build.gradle` file that is typically located at `<app-name>/android/app/build.gradle`.
-
-   ```gradle
-   dependencies {
-     // ...
-   
-     implementation 'com.google.firebase:firebase-messaging:<latest_version>'
-   }
-   ```
-   
-   Note: you can find out what the latest version of the plugin is [here ("Cloud Messaging")](https://firebase.google.com/support/release-notes/android#latest_sdk_versions).
-
 1. Add an `Application.java` class to your app in the same directory as your `MainActivity.java`. This is typically found in `<app-name>/android/app/src/main/java/<app-organization-path>/`.
 
    ```java

packages/firebase_messaging/android/build.gradle

@@ -32,7 +32,7 @@ android {
         disable 'InvalidPackage'
     }
     dependencies {
-        implementation 'com.google.firebase:firebase-messaging:20.0.1'
+        api 'com.google.firebase:firebase-messaging:20.1.0'
         implementation 'androidx.annotation:annotation:1.1.0'
         implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'
     }

packages/firebase_messaging/pubspec.yaml

@@ -2,7 +2,7 @@ name: firebase_messaging
 description: Flutter plugin for Firebase Cloud Messaging, a cross-platform
   messaging solution that lets you reliably deliver messages on Android and iOS.
 homepage: https://github.com/FirebaseExtended/flutterfire/tree/master/packages/firebase_messaging
-version: 6.0.14
+version: 6.0.15
 
 flutter:
   plugin: