[firebase_messaging] remove obsolete docs instruction (#1532)

packages/firebase_messaging/CHANGELOG.md

diff --git a/packages/firebase_messaging/CHANGELOG.md b/packages/firebase_messaging/CHANGELOG.md
index ed659df..2a11382 100644
--- a/packages/firebase_messaging/CHANGELOG.md
+++ b/packages/firebase_messaging/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.0.0+4
+
+* Remove obsolete `use_frameworks!` instruction.
+
 ## 4.0.0+3
 
 * Update iOS configuration documentation.

packages/firebase_messaging/README.md

diff --git a/packages/firebase_messaging/README.md b/packages/firebase_messaging/README.md
index 379e2d4..e692ef3 100644
--- a/packages/firebase_messaging/README.md
+++ b/packages/firebase_messaging/README.md
@@ -41,8 +41,6 @@
 
 1. In Xcode, select `Runner` in the Project Navigator. In the Capabilities Tab turn on `Push Notifications` and `Background Modes`, and enable `Background fetch` and `Remote notifications` under `Background Modes`.
 
-1. Remove the `use_frameworks!` line from `ios/Podfile` (workaround for [flutter/flutter#9694](https://github.com/flutter/flutter/issues/9694)).
-
 1. Follow the steps in the "[Upload your APNs certificate](https://firebase.google.com/docs/cloud-messaging/ios/client#upload_your_apns_certificate)" section of the Firebase docs.
 
 ### Dart/Flutter Integration

packages/firebase_messaging/pubspec.yaml

diff --git a/packages/firebase_messaging/pubspec.yaml b/packages/firebase_messaging/pubspec.yaml
index ebc12e2..fc2d538 100644
--- a/packages/firebase_messaging/pubspec.yaml
+++ b/packages/firebase_messaging/pubspec.yaml
@@ -3,7 +3,7 @@
   messaging solution that lets you reliably deliver messages on Android and iOS.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/firebase_messaging
-version: 4.0.0+3
+version: 4.0.0+4
 
 flutter:
   plugin: